托福词汇列表
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[296-183] gratuitous
adj.不需要的(unwanted)
读音
【例】 Her gratuitous performance is not expected by the producer.
[296-183] indispensable
adj.不可缺少的，绝对必要的(essential.vital)
读音
[296-183] imperative
adj.急需的(necessary，urgent)
读音
【例】 The man is dying；an immediate operation is imperative.