Please replace the water filter in the break room before the end of the week.

請在這週結束前更換茶水間的濾水器。

Our new spam filter blocks most unwanted emails before they reach your inbox.

我們新的垃圾郵件過濾器會在大部分不需要的郵件進入收件匣前就把它擋下來。

The technician said the air conditioner's filter must be cleaned every three months.

技術人員說冷氣的濾網每三個月就必須清洗一次。