The gear just would not come unstuck.

齿轮就是松不开来.

《现代汉英综合大词典》

I always knew that the politician would come unstuck somewhere.

当时我心里就一直认定这个政客总有一天会落得个一败涂地.

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The gears locked in second and would not come unstuck.

变速箱有一会儿锁住了,无法松开.

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This envelope has come unstuck.

这个信封开了.

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The flap of the envelope has come unstuck.

信封的封口脱胶散开了.

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The envelope has come unstuck.

信封开了.

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