Cowan screen
[化] 寇文(离心式)圆筛
🧩 词语组成解析
考恩（人名）
screen
[skrin]
n. 屏幕;银幕;屏风;
vt. 掩藏;庇护;检查;放映;
🗣️ 情景例句
and Philip was opening his first medical office.
而Philip则第一次开诊所。
Open your books and turn to page 20.
打开书，翻到第20页。
and it is only in the seas and rivers, and sometimes lakes, where mud and sit have been continuously deposited,
所以只有在泥沙不停淤积的海洋和江河里，有时在湖泊里，