Mother has been on that medicine for months, and it doesn’t seem to do her any good.(妈妈服那种药好几个月了,似乎一点不见效。)这里be on something表示定期服用某种药物。 The new publicity manager is really on the ball.(新公关经理的确很内行。)be on the ball表示思想敏锐,熟悉情况。
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