Something that used to be pushed, pedalled or carried now has a motor doing the work, so it moves under its own power.
可以想成一樣本來要人出力的東西——用手推的輪椅、用腳踩的腳踏車、用手拉的窗簾——被裝上一顆馬達，從此它自己會動。這個詞的中心畫面大概就是那個交接的瞬間：出力的人退開，馬達接手。
登入就可以看每一支怎麼連回核心畫面。
Something that used to be pushed, pedalled or carried now has a motor doing the work, so it moves under its own power.
登入就可以看每一支怎麼連回核心畫面。