例句與造句

1. One half houses a filtration system of beds of gravel and carbon.
2. The of Leyden in 1601 was a perfect square divided into quarters for the four continents, but by 1720, though, it was a rambling system of beds, struggling to contain the novelties rushing in, and it became better known as the.
3. It's difficult to find system of beds in a sentence. 用system of beds造句挺難的