Inside the training building, pilots and instructors sit behind controls and computer screens.

VOA: standard.2010.07.27

They're not responsible necessarily for moving molecules inside and out, but they sit at the outside of the cell and they wait for signals.

它们不负责将分子运进运出,而是冲着细胞外面坐等信号

耶鲁公开课 - 生物医学工程探索课程节选