pump

彰化縣人師教育協會

The girl is using a pump to fill the bicycle tires with air. 

這個小女孩正在用打氣筒幫腳踏車的輪胎打氣。

She uses the pump by stepping on the pedal, causing the tire to fill with air.

她踩著打氣筒的踏板讓輪胎充氣。

彰化縣和美鎮和仁國小

Students are using a pump to keep a ball in the air.

學生們正在使用打氣筒將球保持在空中。

By moving the air pump up and down, the students make the ball float.

學生們上上下下壓打氣筒使球漂浮。