很多运河是按照地图上的坐标线开凿的。
目标线程在某个安全检查点检查该信号。
The target thread checks the signal at certain safe checkpoints.
可以增加色标挤出机，使生产的管材拥有色标线。
The line can be equipped with another extruder used for extruding the mark line.
目标点；目标线；目标区(圆)；目标区(矩形)。
Target Point; Target Line; Target Area (circle); Target Area (rectangle).
“实际上我喜欢爬在地板上查看各种建筑标线，”他解释道。
"I actually like to crawl on the floor and look at the lines," he explained.
“实际上我喜欢爬在地板上查看各种建筑标线，”他解释道。
"I actually like to crawl on the floor and look at the lines," he explained.
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