Filtrations
(filtration 的復(fù)數(shù)) n. 過(guò)濾\\n[化] 過(guò)濾
??? 情景例句
Tom gave Helen an apple in exchange for a piece of cake.
湯姆用一個(gè)蘋(píng)果和海淪換一塊蛋糕。
Most things have two handles.
大多數(shù)事物總有兩種解釋。
Fortunately, however, ancient men made tools of stone, especially flint,
然而， 幸運(yùn)的是，遠(yuǎn)古人用石頭制作了工具，特別是用燧石，