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.
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.
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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