摘要:1.表示义务.意为“应该 .口气比should稍重. We ought to defend our country. 我们应当保卫我们的国家. You ought to respect your parents. 你应当尊敬你的父母. Oughtn't we to do everything possible to stop pollution 难道我们不应当尽可能地制止污染吗?
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