发誓;

You'd think he'd learn. Especially when he promised Mother on oath he'd never jump again.
你以为他会记住这教训吧, 尤其是他还对母亲发过誓,答应再不跳了.
来源:飘(部分)Evidence is given on oath and witnesses are subject to cross-examination .
证人宣誓后作证,并接受 盘问.
来源:《简明英汉词典》
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