It may be that our bodies evolved to depend on at least low levels of worm-produced compounds to keep them running within normal bounds.
而人类身体的进化又需要依赖这种由蠕虫产生的至少低水平的化合物才能保证其在正常范围内运作。
2
You must keep your hopes within reasonable bounds.
你必须把你的希望寄予合理的范围之内。
3
It hopes to join the ERM-2 (a pledge to keep the exchange rate within agreed bounds for two years) early next year in order to qualify for euro membership by 2012.