对虾中某种效力大的化学成分会导致难产。
Certain potent chemicals in prawn precipitate difficulties during delivery.
他效力过的球队有丹佛、亚特兰大、费城、新泽西、纽约和休斯顿。
He has played for Denver, Atlanta, Philadelphia, New Jersey, New York and Houston.
酒精浓度增长2%听起来差别不大，但是，它对葡萄酒品质和效力的影响相当大。
A 2 percent increase in alcohol may sound like a tiny difference, but the effect on a wine's character and potency is considerable.
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