Some of the machine tools are so small that they can be moved by hand. Others arc so big that they weigh 100 tons or more.

有些机床很小，用手就可以搬动；另外一些则很大，重达100吨或100吨以上。

youdao

An arc motion would make people's gaze stick to the curving hand and stay there, while a straight line would make their eyes flick back to the beginning and jump between the two.

弧形移动能使人注视弯曲的手并在移动终止点集中注意力，但直线移动会让人目光闪回起始点，并在两点间移动。

youdao

They rose ever more slowly, paused, shining, at the top of their arc, and then in accordance with everything our Galilean ape brains have ever learned to expect, crashed back down into his hand.

钥匙们闪着光缓慢的上升，在抛物线的尽头短暂停留，而后不出意外的又掉落回他手中。

youdao

It bends because all of us are putting our hand on the arc and we are bending it in that direction.

WHITEHOUSE: Remarks by the President at a DNC Event

"The coastal plain of the refuge is only a tiny fraction of the entire North Slope of Alaska, " he argued, waving his hand in a wide arc.

CNN: mountain

Deep in the shine of the polished glass, her hand rose in a graceful arc to remove her straw hat.

NEWYORKER: Miracle Polish