The drugs work well at first but gradually lose their effectiveness.
这些药的效果起初非常好,但后来逐渐失效.
来源:《简明英汉词典》Her manner seemed unpleasant at first, but she improved on further acquaintance.
起初她的举止让人很不愉快, 但是经过进一步接触她改了许多.
来源:《简明英汉词典》She didn't feel a bit nervous though it was the first time she'd spoken in public.
她虽是第一次当众讲话,却一点都不发慌.
来源:《现代汉英综合大词典》The horse was tired, but the rider spurred him on and reached the post first.
那匹马累了, 但骑手仍策马疾驰,终于第一个跑到终点.
来源:《简明英汉词典》
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