1 (尤指当had为助动词时,you had的常用口语形式) You'd is the usual spoken form of 'you had', especially when 'had' is an auxiliary verb. (尤指当had为助动词时,you had的常用口语形式)
2 (you would的常用口语形式) You'd is the usual spoken form of 'you would'. (you would的常用口语形式)
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With your hair and your beautiful skin, you'd look good in red and other bright colors.
以你的发色和漂亮的肤色,穿红色或者其他亮色的衣服会很好看的。