有两个方向
双语例句原声例句
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现在，垂直于同一个平面的，有两个方向。
Now, there's two different possible directions that are perpendicular to a plane.
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生有两个方向很重要：一个是出门，一个是回家。
It's important to have two directions: one is to go out, the one is to go home.
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透辉石有两个方向的完全解理，通常为孪晶生成，短且成圆柱形，断口参差不平。
Diopside crystals have a perfect cleavage in two directions, are often twinned and are short and columnar, but with an uneven fracture.
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So any time you have two atoms bonding, the bond axis is just the axis that they're bonding along.
任何时候如果你有两个原子成键，键轴就是它们成键的方向。
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If we have, coming along this z axis, another carbon atom, we can actually form one bond between the two carbon atoms there.
如果我们在z方向，有另外一个碳原子，我们可以在,两个碳原子之间形成一个键。
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Synthesis always occurs in one direction and that makes sense to you now because you know there's a directionality and the chemistry is different going one way than the other and this DNA polymerase only works on the chemistry going in one direction.
NA复制过程是单向的,现在你们该明白原因了,因为DNA单链有方向性,DNA在两个方向上化学性质不同,DNA聚合酶,只在一个方向上起作用
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