有二叶的

A thorough family history should be taken because many cardiac disorders （eg, coronary artery disease , systemic hypertension, bicuspid aortic valve, hypertrophic cardiomyopathy, mitral valve prolapse） have a heritable basis.

很多心脏疾病（如冠状动脉疾病、全身性高血压、二叶主动脉瓣疾病、肥厚型心肌病、二尖瓣脱垂）都有遗传基础，因此应收集详尽的家族病史。

Approximately 1% of all infants born alive in the US have bicuspid aortic valves.

在美国，大约有1%的新生儿出生时为二叶主动脉瓣。

The most valuable role that CMR plays in patients with valvular heart disease is in determination of left and right ventricular function with a lesser role for precise identification of valve anatomy such as identification of bicuspid aortic valves, vegetations, etc.

CMR在瓣膜性心脏病患者中发挥的最有价值的作用就是测定左，右心室功能，较有价值的作用就是精确鉴定瓣膜的解剖，如二叶主动脉瓣、赘生物等。

The answer to the questions just posed is two fold: aortic stenosis in 2009 is the result of congenital bicuspid aortic valves and atherosclerotic/calcific aortic valves.

这个问题的答案有两个方面：2009年主动脉狭窄常见于先天性二叶主动脉瓣及动脉粥样硬化/钙化性主动脉瓣病。

DPU at a concentration of as low as 10^(-7)mol/L retained the chlorophyll of Spirodela half-fronds under long-day conditions. From 10^(-5)~2×10^(-4)mol/L it prompted the synthesis of chlorophlly and the serine: glyoxylate aminotransferase activity, increased dry weight, and retarded the senescence of half-fronds.

在长日照条件下，10^(-7)mol/L的二苯脲对紫萍半叶状体就有保绿的作用，10^(-5)~2×10^(-4)mol/L的二苯脲还可以明显地促进叶绿素的合成和干重的增加，提高丝氨酸：乙醛酸转氨酶的活性，延缓半叶状体的衰老。

Gentleman orchid drenchs rot the root dies after water, the likelihood has the reason of two respects, it is basin earth too wet, because gentleman Lan Xihuan is loose,understand the edaphic requirement that appear, once basin earth is medium moisture is too big, its bulky flesh pledges the root arrived to will come in October between November, already entered stop to grow or grow very slow condition, do not need how many moisture, need to hold basin ground only wet can, drench water causes those who rot the root is unavoidable too much; 2 it is you drench when water, flow into the phyllome center of plant the dirt that will have smudgy part along with all the others, and at this moment water of blade rising bad news is less, sewage accumulating is inside Xie Cong, also can choose sodden heart sodden root.

君子兰淋水后烂根死亡，可能有两个方面的原因，一是盆土过湿，因君子兰喜欢疏松通透的土壤条件，一旦盆土中水分过大，其粗大的肉质根到了10月至11月间，已进入停止生长或生长很慢的状态，不需要多少水分，只需要保持盆土湿润即可，淋水过多造成烂根是在所难免的；二是你淋水时，将会有脏污成分的尘土等一并流入植株的叶丛中心，而这时叶片蒸腾耗水较少，脏水积在叶丛内，也会选成烂心烂根。

It resembles the psilophyte Rhynia from the Rhynie chert of the Devonian period.

库克逊蕨属有无叶的纤细二叉分支状的茎，成熟孢子囊和孢子充分角质化，该植物与在泥盆纪 Rhynie 燧石中找到的裸蕨中的羊角蕨属很相像。

The results indicate seawater concentration has no effect on absorbency, pH, relative density, dry matter and water contents in Aloe vera leaves. While, seawater stress causes increased MDA and membrane penetration, decreased phytochroms, prolines and NO_3~--N. It is beneficial to plant growth when irrigation was done with 10% seawater, because of higher ratio of K~+/Na~+ and lower ratio of Na~+/Ca~(2+). In addition, the polysaccharide contents in Aloe vera leaves increase twice and triplication under 25% and 50% seawater irrigation respectively, the barbaloin contents increase over triplication in var. 75% seawater and over twice in var. 50% seawater and var. 100% seawater. However, when seawater concentration exceeds 25% the growth of plant was inhibited, biomass decreased, flowering time was deferred, Ca~(2+) content decreased caused by Na~+ accumulation in leaves.

结果表明：在海水胁迫下，库拉索芦荟全叶汁的吸光度、酸度、相对密度、总固形物和水分含量总体上受海水浓度的影响不大；但芦荟叶的丙二醛含量和质膜透性增加，叶绿体色素、脯氨酸和硝态氮含量减少；在10％海水浇灌下，芦荟叶细胞具有较高的K~+／Na~+比和较低的Na~+／Ca~(2+)比，对库拉索芦荟的生长有一定的促进作用；在25％海水和50％海水浇灌下，芦荟多糖含量提高了2-3倍；在75％海水浇灌下芦荟甙含量增加了3倍多，在50％海水和100％海水灌溉下，其含量也增加了2倍多；当海水浇灌浓度超过25％后，库拉索芦荟的生长明显受到抑制，生物量降低，抽苔期推迟，同时，海水浓度的增加也导致芦荟叶中累积大量Na~+，从而使得芦荟叶中Ca~(2+)含量降低，但Mg~(2+)并没有受到海水浓度的影响；用浓度低于75％的海水浇灌库拉索芦荟可以降低剖面深度在0-100cm之间的土壤盐度；其抗氧化保护酶中超氧化歧化酶的酶活力相对保持稳定，过氧化物酶的酶活力在10％海水浇灌下明显提高，随后则下降，而过氧化氢酶的酶活力则随海水浓度的升高而下降。

Just like the mitral valve, the leaflets have thin chordae tendineae that attach the leaflet margins to the papillary muscles of the ventricular wall below.

与二尖瓣一样，瓣叶有薄博的键索连接着瓣叶边缘与心室壁上的乳头肌。

The result indicates that with organic fertilizer and inorganic nitrogen fertilizer can obviously increase the leaf dimension coefficient, enhance the content of chlorophyll and soluble protein, improve the SOD activity of flag leaf, depress the content of MDA, postpone the speed of decrepitude of flag leaf,; The status with high content of chlorophyll and leaf dimension coefficient lasts longer with organic fertilizer than with inorganic nitrogen fertilizer and the flag leaf have longer functioning time; the combination of inorganic nitrogen fertilizer and organic fertilizer can substantially postpone the speed of decrepitude of winter wheat.

在国内持续时间最长的肥料长期定位（28年）试验条件下，研究了肥料持续施用下冬小麦花后叶面积系数等生理指标的变化，结果表明施用有机肥、氮肥，可明显增大小麦的叶面积系数，增加叶绿素含量和可溶性蛋白含量，提高旗叶的SOD活性，降低丙二醛的含量，延缓旗叶的衰老；施用有机肥较施用氮肥，叶绿素含量及叶面积系数持续高值时间长，旗叶有更长的功能期；长期氮肥与有机肥配施能显著延缓小麦衰老。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷