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Secondly, according to the stem and leaf anatomy, leaf epidermis, pollen morphology and floral development, it is found that there are no close relations between Acorus and Typhales, especially in the aspect of floral development. In the course of floral development of A. calamus, neither bracteloe primordium nor common primordium occurs in the whole course. Early development of the flower is strongly unidirectional. Three shield carpels develop into a pistil. In Sparganium fallax, each female flower has a bracteole. The bracteole primordium and the floral primordium originate from a complex structure. A single saccate carpel develops into a pistil. In staminate flowers, petal and stamen primordia initiate spirally.

菖蒲属与香蒲目的茎叶解剖特征、叶表皮特征、花粉特征及花器官发生特点等亦存在着明显区别，特别是花器官发生特点差异尤为显著，如菖蒲属花器官发生过程中，没有苞片原基，也不存在任何形式的复合原基，花被与雄蕊原基均以单向性方式发生，雌蕊由3心皮发育而成，具有"盾状心皮"的特点等，黑三棱属则有苞片原基发生，且苞片原基与雌花原基起源于共同的复合结构，雄花的花被原基和雄蕊原基均以螺旋状方式发生，雌蕊由单心皮发育而成，未发现有2或3个心皮原基或其痕迹的现象，体现出"囊状心皮"的特点。

Core branch prediction occurs inside the Instruction Fetch Unit using many familiar predictors.

Core的分支预测发生在指令读取单元。

The Brazil Current extends S to the latitude of Rio de la Plata where interaction with the N-flowing cold Falkland Current occurs.

The巴西潮流传播S到与N流动的冷的福克兰潮流的互作用发生Rio de la Plata的纬度。

We seem to break out into an argument about absolutely nothing, and this unpleasant state of things usually occurs at meal-times.

反正总是毫无原由的争吵，这种不愉快的状态通常发生在吃饭的时候。

One of the first signs of a severe heartburn episode is a sharp, burning feeling that occurs just beneath the breastbone or the ribs.

第一个迹象，严重的心插曲是一个尖锐的，灼热的感觉所发生的只是下方breastbone或肋骨。

Dolomite also occurs in this mode as replacement of limestone along major fractures and betts of enclosed breccia.

沿包围角砾岩的主要裂隙带，以交代石灰岩的方式，也能形成白云石。

Breeding occurs at any time of the year.

育种发生在一年的任何时间。

For different substances that occur under two different light sources in two different stripes, when the slit mouth gradually Masuda Otsuki reduced, this process will find in the thin section of a gas light appears under the of the color overlay each other like , so that spectra of surface light intensity gradually weakened and finally win only the lower part of the spectrum not being added to the surface occurs, known as:"Bright-Line Spectrum."

对于不同物质在两种不同光源下出现的两种不同条纹，当把狭缝口逐渐増大即缩小，这一过程会发现在稀薄气体光源下出现一段一段的各单色象相互叠加，从而使谱面中光强逐渐减弱，最后只胜下部分沒被叠加到的谱面出现，被称为："明线光谱"。

In some cases, a rebound bronchocontriction occurs as the bronchodilator effect wears off.

在某些病例中，随着支气管夸张作用的逐渐减弱，会出现反跳型支气管收缩。

As it is argued by Brophy and Alleman(1998), in this type of environment learning occurs when faculty develop and encourage discussion through the use of social interaction .

就像 Brophy 和 Alleman 于1998年所指出的那样，在这样的环境中，当教学人员通过利用社会交往理论开展并鼓励讨论时，学生们就会展开学习。

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。