用你的粉笔线在地板上画两条相交的线。
Snap two intersecting lines over the floor with your chalk snapline.
如今那道粉笔线是抹掉了，但那个禁圈仍然存在。
The chalk line has been wiped away to-day, but the confining ring is still there.
我侧身从屋顶一端走到另一端，划好粉笔线，钉好芳香的摇板。
Snapping chalk lines, I crabbed myself from one side of the roof to the other, tacking down the fragrant shakes.
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