Emptying the tank too often is inefficient in terms of manpower and can have knock on effects on the operation of other parts of the sludge treatment system.
过于频繁的清理是浪费劳动力，并且可能降低污泥处理系统其他设备的正常运作的效果。
There is only so much fuel in the tank and if you burn it up too quickly you are in trouble.
油罐里只有这么多燃料了，如果你用得太快，就有麻烦了。
I'm not sure that your fish will be able to remember what your face looks like, but I wouldn't be too surprised if it could remember you in other ways, perhaps by the sound of your footsteps as you walk towards the tank.
我不确定你的鱼是否能记住你的脸，但如果它能以其他方式记住你，也许是通过你走向鱼缸时的脚步声，我也不会太惊讶。
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