overlap

The roof tiles must overlap each other to ensure that no rainwater leaks into the house.

(Chinese) 屋顶瓦片必须互相重叠，以确保雨水不会渗漏到屋内。

My biology class and chemistry lab overlap on Tuesdays, so I need to change my schedule.

(Chinese) 我的生物课和化学实验在周二时间冲突（重叠），所以我需要更改课表。