We used a screen to sift the sand for our science class.
我們用篩子為自然課篩沙子。
The window screen keeps mosquitoes out at night.
紗窗在晚上可以防止蚊子進來。
The cook used a metal screen to sift flour.
廚師用金屬篩子來過篩麵粉。
Dad cleaned the screen on the fan because it was dusty.
爸爸清洗了風扇上的過濾網，因為太多灰塵了。