Learner's definition of YOU'D
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used as a contraction of you had or you would用作you had或you would的缩约词 -
If you'd [=you had] read the note, it would have saved us some trouble.如果你当时读了便条，我们就会省去一些麻烦。
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You'd [=you would] be surprised how easy it was to assemble.你会惊讶地发现组装是多么容易。