除非另有注明，本图采用毫米为长度单位。
Millimeter is used as length unit in this drawing unless otherwise noted.
公制是基于以米为长度单位，克为重量单位，公升为容积单位的测量系统，它们都是十进位。
The metric system is the measuring system based on the meter for length, the gram for weight and the liter for capacity, which counts by tens.
从服务器向浏览器发送的信息的长度，以字节为单位。
Length of the information, in bytes, sent from the server to the browser.
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