机械能是守恒的，因为重力是守恒力。

Mechanical energy is conserved, because gravity is a conservative force.

youdao

“守恒”这个词来自于物理学;,如果说能量守恒。

Well, the word conservative comes from the idea in physics; if the conservation of energy.

youdao

显然是质量守恒，而不是摩尔数守恒。

So, clearly, mass is conserved, not mole Numbers.

youdao

显然是质量守恒，而不是摩尔数守恒。

So, clearly, mass is conserved, not mole Numbers.

youdao