It is my job to make sure that all pathways are clear of obstructions.

保证所有的道路通畅是我的职责。

If all the coronary arteries are free of significant obstructions, all parts of the heart will receive equal amounts of oxygen.

如果冠状动脉没有重大堵塞，心脏的各个部位会收到等量的氧气。

Check and remove any obstructions.

检查并移去一切障碍物。

Remove any possible obstructions from the lobby area.

撤离大堂区域内所有的障碍物。

The absence of obstructions is of course an idealization.

没有障碍物的情况当然是一种理想化的情况。