What I should have bought was just a simple sprinkler that fits on the end of the garden hose.
我真该买一个简单的洒水器，能和花园的软管头接上就行了。
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But there are also some disadvantages in it, for example, single sprinkler hard hose traveler waste much energy, hydraulic losses are large, so optimize design of it become especially important.
What's cool about this rolling lawn sprinkler is that it harnesses the power of water pressure to propel itself forth on the garden hose and get about the business of watering your garden.