一些地质学家想知道，是否可以用构成断层的岩石来解释没有摩擦产生的热量。

Some geologists wondered whether the absence of friction-generated heat could be explained by the kinds of rock composing the fault.

youdao

如果没有摩擦力，如果没有其他力，只有重力。

If there is no friction, if there are no other forces, only gravity.

youdao

若这棒上没有摩擦力，那么。

If there is no friction at all in this bar, then...

youdao