give evidence as a witness in a law court
作证
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he testified against his own commander 他做了不利于自己指挥官的证明
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[with clause]
he testified that he had supplied Barry with crack .他作证说他为巴里提供了可卡因。
serve as evidence or proof of something's existing or being the case
证明
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the bleak lines testify to inner torment .凄凉的皱纹表明了内心所受的折磨。
"late Middle English: from Latin