pass of water

Instead of passing water molecules, these membranes pass ions.

跟让水份子通过不同的是，这些过滤膜让离子通过。

I pass the bottled water - with stainless steel water bottles for each member of my family, I wouldn't think of wasting money on bottled water.

我越过瓶装水——每个家庭成员一个不锈钢水杯，我不用浪费钱在瓶装水上了。

The membrane’s protein channels, each just a few nanometers across, allow a stream of water molecules—and only water molecules—to pass single file at a rate of one billion per second.

这种膜上的蛋白通道，直径只有几个纳米，可以（也只可以）让水分子通过，其通道每秒可过滤10亿个水分子。