filter, primary

• 第一滤片； 原滤片

filter, primary的用法和样例：

例句

1. The built-in filter of a solenoid valve can be cleaned without dismantling its sleeve, but simply unscrewing its nut to pull out the plastic filtering plate.
   本电磁阀自带的过滤器无需拆卸管子即可非常方便的清洗，只需用手拧下螺帽，拔除塑料滤片即可清洗。