The organisms that stay in the tube of toothpaste are the fittest. The others get flushed down the drain.
最终,管子是会破的,停留在牙膏管里的是适者,其他的就付之东流了。
Between your middle ear and your throat there is a passage called the eustachian (say: yoo - stay -she-un) tube.
耳朵感染是怎样引起的?中耳和咽喉之间的通道叫耳咽管。
In order to stay as more microorganism as possible in the river on trial, tube biological carriers were set in the river.
为了使投加的微生物能尽可能多的停留在河里,在试验河段中部设置了管式生物载体。
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