filter

1. V-T To filter a substance means to pass it through a device which is designed to remove certain particles contained in it. 过滤

The best prevention for cholera is to boil or filter water, and eat only well-cooked food. 预防霍乱最好的方法是把水煮沸或过滤，并且只吃煮熟的食物。

2. V-I If light or sound filters into a place, it comes in weakly or slowly, either through a partly covered opening, or from a long distance away. (光、声) 透入

Light filtered into my kitchen through the soft, green shade of the honey locust tree. 光线透过皂荚树柔和的绿荫照进了我的厨房。

3. V-I When news or information filters through to people, it gradually reaches them. (新闻、信息等) 逐渐传开

It took months before the findings began to filter through to the politicians. 几个月后调查结果才开始逐渐传到政治家们那里。

News of the attack quickly filtered through the college. 袭击的消息很快就在这所大学传开了。

4. N-COUNT A filter is a device through which a substance is passed when it is being filtered. 过滤器

...a paper coffee filter. …一张咖啡滤纸。

5. N-COUNT A filter is a device through which sound or light is passed and which blocks or reduces particular sound or light frequencies. 滤声器; 滤光器

You might use a yellow filter to improve the clarity of a hazy horizon. 你可以用一个黄色滤光器来提高模糊的地平线的清晰度。