flat： [flæt] n. 公寓，平地，平面 adj. 平地，單調的，平坦的，扁平的
I have sublet a flat to my friend for the summer.
夏天我把一套公寓轉租給一個朋友。
In ancient times the world was conceived of as flat.
在古代地球被認為是扁平的。

apartment： [ə'pɑːtm(ə)nt] n. 公寓（美式英語），房間（英式英語）
Jane finally broke away from her parents and got an apartment of her own.
簡最終脫離了她父母，有了自己的公寓房間。

apartment block 公寓大樓
block [blɒk]n. 塊；街區；大廈；障礙物
Hold on to the third block, then turn left.
一直往前走，到第三個街區后向左拐。
They also must have understood that the car could not pass through the block.
它們一定還知道玩具車不可能通過障礙物。

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