a sign of与 a sign for有什么区别？ sign in和sign up有什么区别

A sign of \u662f\u4ec0\u4e48\u610f\u601d\uff1f\u5feb\u901f\u56de\u7b54\uff0c\u5b66\u9738\uff0c\u5e2e\u5e2e\u5fd9~

\u2026\u2026\u7684\u8868\u73b0;\u2026\u2026\u7684\u5f81\u5146

sign in
\u82f1 [sain in] \u7f8e [saɪn ɪn]
I signed in and crunched across the gravel to my room.
\u6211\u7b7e\u5230\u540e\u560e\u5431\u560e\u5431\u8d70\u8fc7\u77f3\u5b50\u8def\u6765\u5230\u6211\u7684\u623f\u95f4\u3002
sign up
\u82f1 [sain ʌp] \u7f8e [saɪn ʌp]
He signed up as a steward with P& O Lines.
\u4ed6\u7b7e\u7ea6\u4e86P&O\u822a\u8fd0\u516c\u53f8\uff0c\u6210\u4e3a\u4e86\u4e00\u540d\u4e58\u52a1\u5458\u3002

这个东西的标志，记号
后者是为……做的标记

a sign for 代表的是...的兆头，手势
a sign of 表示...的标志，...的迹象，符号

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这个东西的标志，记号
后者是为……做的标记

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