Gravel filter
[醫] 卵石濾池
?? 詞語組成解析
gravel
['ɡr?vl]
n. 沙礫，碎石;礫石;[醫]結石;
vt. 以礫石鋪路;使困惑;使（船）擱淺在沙灘上;
filter
['f?lt?]
n. 濾波器;濾光器;濾色鏡;[化] 過濾器;
vi. 過濾;透過;滲透;
vt. 過濾;濾除;
??? 情景例句
Who's in charge here?
這兒誰負責？
If it hadn't rained so hard yesterday, we would have played tennis.
如果昨天沒下那么大的雨，我們就去打網球了。
The day after, Patrick went to the house once more and asked exactly the same question.
第三天，帕特里克又去了，提出了同前兩天完全一樣的問題。