那个告密者向老板透露了同事的计划。
The ___telltale revealed his colleague's plan to the boss.
他紧张时不停抖腿的小动作是个明显的破绽。
His constant leg shaking was a ___telltale sign of nervousness.
引擎发出的奇怪噪音是机械故障的明显征兆。
The strange noise from the engine is a ___telltale sign of mechanical problems.
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