The fanned air is then discharged from the front side of the base, blowing off saw dust on a cutting object so as to prevent dust from accumulating on a marking line on the cutting object.

扇动空气从底板的前端向前吹出，吹掉切割对象上的锯屑，从 而防止锯屑聚集在切割对象上的标记线上。

youdao

You can see from this picture of the 1903 World Series that there are no outfield fences, although there was likely a chalk line or a rope marking how close spectators could come to the field.

FORBES: Connect

Whatever her motivation, she finally caved and penned a jagged line down PR-184, marking an X in the middle of nowhere.

BBC: Puerto Rico��s Pork Highway

They range from grandfathers with traditional flowing sarongs hanging over their bare feet to teenagers clad in polo shirts and trainers, all climbing the 5, 000-odd stone steps that are illuminated by electric lights throughout the night, a glowing white line spiralling up the mountain and marking the way to the top.

BBC: Getting to the heart and soul of hilly Sri Lanka