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The main reason I decided to move to this city was to be closer to my family.

(Chinese) 我决定搬到这座城市的主要原因是为了离家人更近。

Please turn off the main lights when you leave the office at the end of the day.

(Chinese) 下班离开办公室时，请关掉主灯。

A burst water main caused several streets in the downtown area to flood.

(Chinese) 供水主管道爆裂导致市中心的几条街道被淹。

The electrician found a fault in the electricity main coming into the house.

(Chinese) 电工在进入房屋的输电干线中发现了一个故障。