午休

The results showed as follows: The diurnal variations of Pn were "twin peaked" curve, and the peak value occurred at 10:00 and 16:00 or so. There was an obvious "midday depression" phenomenon under full light and middle shading (60%), while it didn't occur obviously under strong shading (80%).

结果表明：毛红椿净光合速率日进程曲线呈"双峰"型，高峰值出现在10：00和16：00，全光照和中度遮荫(60%)情况下有较明显的光合"午休"现象，而强度遮荫(80%)光合"午休"现象不明显。

If you're a regular napper, and experiencing difficulty falling or staying asleep at night, give up the nap and see what happens.

如果你有午休或者打盹的习惯，并且想在晚上更容易睡着，睡个好觉，那么你可以试试先把午休戒掉，看看会发生什么。

The results showed that the diurnal changes of photosynthesis of S. chinensis in tile overstory took on "double-peak" curve with remarkable midday depression. The midday depression was mainly due to non-stomata1 limitations. On the contrary, the diurnal changes of photosynthesis of S. chinensis in the understory took on "one-peak" curve with low Pn. The maximal Pn was only half of that of S. chinensis in the overstory. The correlation analysis showed that the limiting factor for this low Pn might be light intensity (p=0.001). Compared with its accompanying plants, S. chinensis was in a disadvantaged status in the community with low photosynthetic capacity, water use efficiency, and the ratio of photosynthetic rate to respiration rate.

结果表明：夏蜡梅冠层的光合速率日进程呈"双峰"曲线，有明显的"午休"现象，经分析其"午休"的原因主要是由非气孔因素引起的；林下夏蜡梅则表现为"单峰"曲线，净光合速率较低，最大净光合速率不及冠层的1/2，相关分析结果表明其最重要的影响因子是光合有效辐射(p=0.001)；与其它伴生植物相比，夏蜡梅的日均光合速率、最大光合速率、水分利用效率和光合速率／呼吸速率都明显偏低，在群落竞争中处于不利地位。

A portable photosynthesis system made by PPSYSTEM Ltd. was used to study the photosynthetic properties of 3 cultivarsof Rubus idaeus under the field conditions. The results indicated that the individual leave net photosynthetic rates had 2 peaks during a day,an obvious photosynthetic midday slump was observed in A,there was a significant difference in midday depression among the 3 cultivars;evaporation rates of B and C had 2 peaks during a day,while A had 1 peak,and an obvious midday slump was observed in B and C;Stomatic conductance is the key factor of midday slump;Compared with B and C,A had a higher water using efficiency,which will consume less soil water.

利用英国PP-SYSTEM公司生产的TPS-1便携式光合作用测定系统，对3个树莓品种的光合特性进行了比较研究，结果表明树莓叶片光合速率日变化呈双峰曲线，A品种&日中低落&现象明显，B、C品种不甚明显；B、C品种的蒸腾速率日变化曲线基本上为双峰型，日变化过程中的&午休&现象非常明显，而A品种为单峰型，日变化过程中的&午休&现象不甚明显；此外，叶片气孔导度与叶片光合速率的日变化趋势基本一致，呈平行变化趋势，说明气孔导度是影响光合速率的直接因子；较B、C品种而言，A品种具有较高的水分利用效率，说明其更能节约并有效地利用土壤水分。

The results showed that, the diurnal changes of Pn of leaves in eggplant showed a double peak curve (there was a significant "midday depression" at noon), whether of Erming or Kuaiyuan; seedling stage, flowering stage, or fruits growing stage; top leaves, middle part leaves or bottom leaves. But the extent and the time of midday depression were different. The stomatal conductance, transpiratory rate, intercellular CO2 concentration, and air CO2 concentration of eggplant leave were decreased when midday depression was happened, but photosynthetic active radiation and leaf temperature were maximum. The reasons of midday depression of eggplant leaves were stomatal factors.

结果表明，茄子晴天Pn日变化无论品种是否相同、生育期是否相同、叶位是否相同（上部叶片、中部叶片和底部叶片），无一例外地表现为&双峰&曲线，即有光合&午休&现象存在，只是&午休&的时间和程度上有差异；光合&午休&时气孔导度、蒸腾速率、细胞间隙CO2浓度、大气CO2浓度均下降，而光合有效辐射和叶片温度此时几乎处于最大值，茄子光合&午休&是由气孔因素引起的。

The comparative research results showed that:(1)Thediurnal variation of the net photosynthetic rates in the aquatic leaves was a "double-peak", with an various "midday-decline", the time of the peak value appeared at about 10:00 A.M. and 13:00 P.M., while that in the xeric leaves was showed with invarious peak value and "midday-decline"; The diurnalvariation of transpiration ratesof both aquatic and xeric leaves appeared as a single-peak, the appearance time of peak value of the latter was earlier than the former and gradually decreased in the afternoon; The stomatal conductances appearance time of both of them were close to that of photosynthesisrate ,reached to the maximum in the morning and then gradually decreased: Diurnal variation of intercellular CO2 concentrationshows that: both aquatic and xeric leaves increased at first, and then exhibit a tendency of ascending within narrow range.(2) The net photosynthetic rates, photosyntheticallyactive radiation, stomatal conductances and transpiration ratesof both two kinds of leaves showed positive correlation, The correlation degree among them was prominent, there was significant negative correlation between The net photosynthetic rates and intercellular CO2 concentration.

研究结果表明：(1)水生叶片净光合速率的日变化曲线呈双峰型，出现明显的&午休&现象，峰值出现在10：00左右和13：00左右，但旱生叶片表现出的峰型和&午休&现象不明显；两种叶片的蒸腾速率日变化曲线表现为明显的单峰型，旱生叶峰值出现时间早于水生叶，中午过后逐渐下降；两种叶片气孔导度峰值出现时间和光合速率相近，均表现为上午升高至最高，随后逐渐下降的趋势；两种叶片胞间二氧化碳浓度日变化表现为：整体上先下降，然后有一上升趋势：(2)两种叶片的光合速率与光合有效辐射、气孔导度、蒸腾速率呈正相关，全部达到显著水平；光合速率与胞间CO2浓度显著负相关。

Next , a 20-minute nap is best . If you sleep longer , you may fall into a deep sleep . After waking from a deep sleep, you will feei worse .

其次，午休时间以20分钟为宜，如果你午休时间过长，你将陷入深度睡眠中，而当你清醒时，你会觉得更加难受。

A.They want to prove that siestas help people become smarter.

细节题。文章第三段第一句话提到，午休较多的人比从来不午休的人由心脏病致死的几率低了1/3。

Given that all of the subjects of this new study were Greek, could the much-celebrated Mediterranean diet deserve credit, rather than the siestas?

研究表明，那些每周至少午休3次，且每次至少30分钟的成人组与日间从不午休的成人组相比，由心脏病致死的几率低了1/3。

The study found that the group of adults who took 30-minute siestas at least three times a week had a third fewer deaths from heart disease than an equivalent group who did not sleep at all during the day.

这项研究发现，那些每周至少午休3次，且每次午睡至少30分钟的成人组与日间从不午休的成人组相比，患心脏病致死的概率低了1/3。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失