自2010年至今的四级考试中， 共出现过 次
自2010年至今的六级考试中， 共出现过 次
VERB 过滤 To filter a substance means to pass it through a device which is designed to remove certain particles contained in it.
The best prevention for cholera is to boil or filter water, and eat only well-cooked food.
N-COUNT 滤器;过滤器 A filter is a device through which a substance is passed when it is being filtered.
...a paper coffee filter.
N-COUNT 滤声器;滤光器;滤波器 A filter is a device through which sound or light is passed and which blocks or reduces particular sound or light frequencies.
You might use a yellow filter to improve the clarity of a hazy horizon.
VERB (光或声)隐约透过，缓缓传至 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.
Light filtered into my kitchen through the soft, green shade of the cherry tree.
VERB (消息等)走漏，慢慢传开 When news or information filters through to people, it gradually reaches them.
It took months before the findings began to filter through to the politicians...
News of the attack quickly filtered through the college.
N-COUNT (路口的)转弯信号灯(或车道) A traffic filter is a traffic signal or lane which controls the movement of traffic wanting to turn left or right.
PHRASAL VERB 滤除;滤掉 To filter out something from a substance or from light means to remove it by passing the substance or light through something acting as a filter.
Children should have glasses which filter out UV rays...
Plants and trees filter carbon dioxide out of the air and produce oxygen.