Huge balloons bobbed about in the sky above...一个个巨大的气球在头顶的蓝天中漂浮着。They decorated the room with flowers and balloons.他们用花和气球装饰了房间。Helium is a gas used in balloons.氦是一种用于气球的气体.The first vehicles to navigate the air were bal...
在较高的烯烃情况下, 高能的中间物稳定作用更易出现.With the higher olefins, stabilization of the energetic intermediates occurs more easily.我们实际上遇到介乎此两个极端的中间物.We would actually encounter a mean between these extremes.这样可以得到最高产率的反应中间物,即目的产物.This ...