flat： [flæt] n. 公寓，平地，平面 adj. 平地，单调的，平坦的，扁平的
I have sublet a flat to my friend for the summer.
夏天我把一套公寓转租给一个朋友。
In ancient times the world was conceived of as flat.
在古代地球被认为是扁平的。

apartment： [ə'pɑːtm(ə)nt] n. 公寓（美式英语），房间（英式英语）
Jane finally broke away from her parents and got an apartment of her own.
简最终脱离了她父母，有了自己的公寓房间。

apartment block 公寓大楼
block [blɒk]n. 块；街区；大厦；障碍物
Hold on to the third block, then turn left.
一直往前走，到第三个街区后向左拐。
They also must have understood that the car could not pass through the block.
它们一定还知道玩具车不可能通过障碍物。

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