研究了重氮烯氢向前手性烯烃单侧的非对映选择性转移。

Diastereoselective transfer of the diazene hydrogen to one face of the prochiral alkene was studied.

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立方直升机的这种配置让他可以像直升机一样盘旋，但在向前飞行时，主旋翼的转速可以将下来，让两侧的机翼提供升力，在此情况下，两台螺旋桨推进器就能发挥大作用了。

This means it can hover like a helicopter, but when flying forwards can reduce the speed of the main rotor and let the wings provide part of the lift. Its propellers give the extra oomph.

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当你上体前屈时，脊椎向前移动，但骨盆和骶骨却要保持在原处，特别是屈膝的一侧。

As you begin to bend forward, the spine moves while the pelvis and sacrum tend to remain behind, especially on the side with the knee drawn back.

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