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349 effective—efficient
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这两个词都是形容词,但意思不同。
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effective表示“有效的”、“生效的”:
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His teaching was not very effective. 他的教学效果不好。
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My headache is much better. Those tablets really are effective. 我的头疼好多了,那些药片的确很有效。
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The new interest rate becomes effective next month. 新利息下月生效。
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efficient表示“效率高的”,可指人:
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He needs an efficient secretary. 他需要一个高效率的秘书。
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A good manager is both competent and efficient. 一个好的经理既要胜任又要效率高。
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也可指机器等:
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The diesel engine is highly efficient. 这台柴油机效率很高。
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Our efficient new machines are much cheaper to run. 我们高效率的新机器开起来要便宜得多。
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350 either
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either为不定代词,可表示“两者中的一个”:
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You may take either of the roads. 两条路你走哪一条都行。
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I don’t agree with either of you. 你们两人的意见我都不同意。
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有时不跟of引起的短语:
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Either is acceptable. (两者中)任何一个都可以。
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“Which one do you want?” “1 don’t want either.”“你要哪一个?”“哪一个我都不要。”
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“Would you like tea or coffee?” “I don’t mind. Either.” “你要茶还是咖啡?”“我无所谓,都行”。
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either作主语时,一般跟单数动词:
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Either of the plans is equally dangerous. 两个计划都同样危险。
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但在口语中也有人用复数动词:
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Are either of you taking lessons? 你们两人都在上课了?
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