num.第八十四

Time is sometimes called the fourth dimension. 時間有時被稱為第四度空間。

He toiled on till he was past eighty. 他一直辛苦工作直到年過八十。

There are eighty pages in this book. 這本書有八十頁。

I am a soldier of the fourth cavalry. 我是第四騎兵部隊的一員。

Reserve double room June fourth to tenth inclusive. 預訂雙人房間，六月四日至十日，共六晚，望訂妥復電。

Mars is the fourth planet in order from the sun. 火星是太陽系的第四顆行星。