box section frame 箱式断面梁组成的车架
rolled section frame 型钢框架
Consult the next section for the code block that sets each frame when the mouse is down.
参考下一节中的代码块，它会在鼠标按下时设置各帧。
The next loop section controls setting pixels coordinates only if the frame at that position is greater than the start frame.
循环的下一部分控制像素坐标的设置，条件是当前时间帧在起始帧之后。
Give an approximate time frame for the project in the timing section.
在时机部分为项目设定一个大致时间。
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