trades

The problem, Schweitzer says, is the actual trades were not profitable.

施韦策表示，问题在于，实际交易是无利可图的。

It is probable that the nocturnal trades a way back in the ancestry of all mammals.

这种夜间的“交易”也许可以一直追溯到所有哺乳动物的祖先身上。

Given that there is a living to be made at night, and given that alternative daytime trades are thoroughly occupied, natural selection has favoured bats that make a go of the night-hunting trade.

考虑到夜晚也可以生存，并且可供选择的白天的“交易”完全被占用，它们自然选择偏爱那些成功在夜间进行捕食“交易”的蝙蝠。

Of all the trades in the world, there is only one that really suits me.

世界上所有的行业中，只有一个真正适合我。

When the recovery began, worker shortages first appeared in the high-skilled trades.

当经济开始复苏时，劳动者短缺首先出现在了高技能行业。