Its pilot has to pedal hard to get it into the air.

驾驶员不得不使劲踩踏板才能使它飞上天。

I heard the heavy tread of Dad's boots.

我亲靴子沉重踩踏声。

They get the juice out of the fruit by treading it.

他们踩踏水果从中榨汁。

He pedalled furiously up the hill.

他猛踩踏板向山上骑去。

The organic litter will help to cushion trampling forces, limit the compactability of soils, release plant nutrients, and reduce the erosie forces of rainfall.

这些杂有助于缓冲踩踏地面力量,避免土壤结块成形,释放植营养,而且减少腐蚀。