科學英文填充

Forces always occur [a] in pairs. If an object exerts a force on another object, the second object will exert an equal but [ b] opposite force on the first object. These forces are called [c] action & [d] reaction. They act on two different bodies and are in [e] opposite directions. An object can move forwards by ejecting something [f] backwards. Rockets work on this principle. The fuel for rockets can be in [g] liquid & [h] gas forms.

a,apporsamately
b,firsthand
c,firsthand force
d,power force
e,opposite
f,awaking
g,fire
h,carbonates

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