当处理碰撞问题，物体的速度，在碰撞前无撇号。

When we deal with collisions, the velocities of the objects before the collision are unprimed.

youdao

无撇号的情况下是因为你所指的决定属于这个团体。

There should be no apostrophe because what you mean is that the decision belongs to the group.

youdao

因此能从相对无冰的水面(WL1)上利用油收集装置(200)来收集分离出的油(b4)，该油收集装置可例如具有刷式撇油器。

The separated (B4) oil can thus be collected from the relatively ice-free water surface (WL1) with an oil collecting device (200), which may have for example a brush skimmer.

youdao