下旬

Agonistic behavior and hierarchical formation of the Przewalski's Horse was conducted from the last ten-day in May to the last ten-day in June, 2007, when a new herd was formed and released into the second reintroduction site in Kalamaili Ungulate Reserve, Xinjiang. Focal sampling and all-occurrence sampling methods were used to observe and record the agonistic behaviors of the herd, and the dominance index of each individual was calculated.

2007年5月下旬至6月下旬，针对新组群并放归于卡拉麦里有蹄类保护区第二放归点的普氏野马繁殖群，采用焦点动物取样法和全事件记录法，观测记录了组群和放归初期繁殖群内个体间的争斗行为，以优势指数法确定繁殖群内的个体等级序列。

The reproductive development process of birch was described as follows: Male inflorescences extended from apical bud in early June. In later June, stamen primodium was differentiated in the bract of male inflorescence and the differentiation of bract was generated in female inflorescence. During July, anther layers and archesporial cell were differentiated in anther, then archesporial cell developed into mother microspore cell. Pistil primodium came into being at the same time. In early part of August the meiosis of mother microspore cell started. In later August, mono-nucleus microspore was formed. After September, both male inflorescence and female inflorescence were dormant.

白桦的生殖生长发育过程如下：6月初，雄花序从顶芽中生长出来。6月中下旬，雄花序苞片上分化出雄蕊原基，雌花序分化出苞片。7月，雄花花药分化出花药壁和孢原细胞，孢原细胞演化为小孢子母细胞，雌花序苞腋处分化出雌蕊原基；8月中上旬，小孢子母细胞减数分裂，8月下旬形成单核小孢子；9月后雄花序以单核小孢子状念越冬，雌花序以雌蕊原基状念越冬。

From the second half of February, the campaign that Hunanese tour Hunan will be launched in a full swing via the media in forms of quizzes and lucky drawing; from the second half of April, Hunan Provincial Tourism Bureau will carry out large on-the-spot lucky drawing activities, winners will be granted tickets of above-3 star scenic areas of Hunan for free.

从2月下旬开始，&湘景·湘游—湖南人游湖南&活动将通过媒体，采取湖南旅游知识问答、抽奖的方式全面铺开；4月下旬，省旅游局将举办大型现场抽奖活动，获奖者可免费获得全省3A级以上景区的旅游门票。

This pest has one generation per year. The larva overwintered in the soil, and pupated at the last ten days of March to the first ten days of April in the soil layer of 3-10cm under the ground. The pupal period ranged from 12 to 17 days.

此虫一年一代，以幼虫在土中越冬；翌年3月下旬至4月上旬在3—10厘米土层内化蛹，蛹期12—17天；4月中、下旬成虫出土上树取食桑芽和叶片，交尾后2—7天产卵在枝顶及春季剪梢口下段等处，每头雌成虫产卵44—205粒，卵期15—19天；初孵幼虫入土取食植物。

The results show that Abstract Ericerus pelahas has one generation a year, overwinters by the fertilized femaleadults. It stars to feed and grow in forest march,spawning peak in second or late April.The larva are hatched in second or late May. It goes toleaves and then goes to stem in forest or second June. The male emerged in the second or late October dies after it male with it overwinters in November.

结果表明该虫1年发生1代，以受精雌成虫越冬，翌年3月上旬开始继续取食、生长， 4月中、下旬为产卵盛期，产卵期10~13 天，5月中、下旬为若虫孵化期， 6月上、中旬为若虫定叶、定杆期， 10月上、中旬雄虫羽化与雌成虫交尾后死亡，受精雌成虫11月中旬停止取食开始越冬。

It pupates from March to April the next year. Its eclosion appears from March to April. The occurrences of larvae of the 1st, 2nd, 3rd and 4th generations are in April, June, July and September respectively. From November to December, we may adopt weeding, loosening the soil and burning surface soil and weed while cleaning garden to eliminate larva and pupa.

翌年3月上旬至4月中旬化蛹，3月中旬至4月下旬成虫羽化。4月上旬出现第l代幼虫，6月上旬出现第2代幼虫，7月下旬出现第3代幼虫，9月中旬出现第4代幼虫。11-12月可结合清园进行林地除草、松土，将表土及杂草堆成堆焚烧，消灭幼虫和蛹。

The time from late March to late July every year is black-tailed gulls′breeding season in sea-donkey island.

每年三月下旬到七月下旬是黑尾鸥在海驴岛的繁殖季节。

Black-tailed gulls begin to countership and roost on the island ;in April they start to mate and build their nests.

每年三月下旬到七月下旬是黑尾鸥在海驴岛的繁殖季节。

Or 3cm brown layers occurred in the bottom ice in later April and November,with highest chlorophyll a values of 88.3 and 2810mg/m 3 respectively,and the comparing cell numbers were 3.5×10 6 and 1.21×10 8cells/l.

冰底有色层出现在4月下旬和11月下旬，集中于冰底2～3cm，叶绿素a最高含量分别为88.3mg／m3和2810mg／m3，相应的冰藻数量分别为3.5×106和1.21×108个／升。

Maximum value of ring-porous species-Fraxinus mandshurica , Fraxinus mandshurica , Phellodendron amurense, Quercus mongolica, semi ring-porous Juglans mandshurica, diffuse-porous Betula platyphylla, Tilia amurensis and non-porous Pinus sylvestris, Pinus koraiensis were as following: 430.53, 516. 36, 234. 00, 625. 93, 945. 83, 199. 49, 507. 93, 142. 43, 286. 21cm〓cm〓h〓 in diumal course during the growing season, The sap flow persisted after leaf senescence until the mid-October.

在生长季中环孔材水曲柳、水曲柳、黄波罗、蒙古栎树干液流密度日最大峰值分别为430.53（8月末）、516.36（9月中旬）、234.00（7月下旬）、625.93 cm〓cm〓h〓（9月初）；半环孔材胡桃楸为945.83 cm〓cm〓h〓；散孔材白桦和紫椴分别为199.49（9月上旬）、507.93 cm〓cm〓h〓（8月上旬）；针叶材樟子松、红松分别为142.43（7月中旬）、286.21cm〓cm〓h〓（7月下旬）。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。