1.S 吸入，纳入　process of taking liquid, gas, etc. into a machine, etc.
2.C （液体等）进口　place where liquid, etc. enters
3.C U （一定时期内）进入或纳入的人数　quantity, number, etc. of people entering or taken in (during a particular period)

　One chocolate bar like this is equal to a large meal in calorie intake.　从摄入的热量来说，一块这样的巧克力相当于一顿饱餐。
　The air intake must be silenced to some degree.　进气口的噪声太大，必须在一定程度上加以消除。
Intake in state primary schools is down by 10%.公立小学入学人数下降了10%。