和之前一样，还是把物体放在斜面上，这次不单独拿上来，我要把它和细绳相连。

I'm going to put an object now on an incline again, as we did before and instead of having it sit on its own I'm going to attach to it a string.

youdao

和之前一样，还是把物体放在斜面上，这次不单独拿上来，我要把它和细绳相连。

I'm going to put an object now on an incline again, as we did before and instead of having it sit on its own I'm going to attach to it a string.

youdao