Collisions need not always act to slow particles down.
碰撞并不往往使质点减速。
Atoms, which are very, very small, can be broken down into still smaller particles.
原子虽然很小很小，但仍能分解成更小的粒子。
Larger particles cannot pass through until they have been chewed down to size.
比较大的颗粒在被咀嚼成小块之前，是不能通过的。
The dust particles will settle down in the short run.
尘粒不久就会沉降下来。
Sand particles gradually wear down.
砂子逐渐磨损。
Sand particles gradually wear down.
砂子逐渐磨损。
应用推荐