Serial number: A unique 32-bit non-zero positive number.
序号（Serialnumber）：一个惟一的32 位非零正数。
It is a bit. It was below zero back in the States.
是有一点。在美国现在是零度以下。
The temperature today is a bit low. It has dropped to zero degrees.
今天的气温有点儿低，都到零度了。
The temperature today is a bit low. It has dropped to zero degrees.
今天的气温有点儿低，都到零度了。
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