fall back to the earth 落回到地面上
The airborne clots become cinders which fall back to earth to form cinder cones.
机载凝块成为灰烬的回落到地上，形成渣锥。
These oxides are released into the atmosphere and they can fall back to earth as acid rain.
这些氧化物会被排进大气，然后会以酸雨的形式降回地面。
What frightens me worse is that their space station will probably fall back to earth in a matter of days.
我更害怕是他们的空间站可能会掉到地球上砸到花花草草。
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