The development of step-pool system plays an important role in stream ecology.

山区河流发育的阶梯—深潭系统具有显著的生态学作用。

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The composition and processing principe of carriers pool system are expounded, the total application process is presented with an example.

阐述了载波池系统的构成、工作原理，并结合实例介绍了其工程实现的全过程。

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Some allow you to add riders to cover extras like the mechanical elements of a pool system or hot tub.

WSJ: Is a Home Warranty Necessary in a Hot Market?--WSJ House Talk

Mirra deep cleans any type of in-ground pool surface and water without using the pool's filtration system, hoses or booster pumps, which results in energy cost savings from running these pool systems less frequently.

ENGADGET: iRobot flaunts the Mirra 530 pool cleaning robot, sends the Looj 330 abroad

You may have heard that Bill Gates has a pool with an underwater sound system.

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