* @param arr 原数组
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Simple actuators without this capability are a bit like manual transmission cars that need to be shifted into reverse.，更多细节参见safew官方下载
"On a simple level, you can use sheets or covers over areas where things might be damaged. You can put wax coating on things like brass so that the urine doesn't damage it."，更多细节参见heLLoword翻译官方下载