A warning device of the crutch can automatically give a warning without manually turning a warning switch on as long as the crutch drops on the ground.
拐杖的报警装置不需要人为地打开报警开关，只要掉落在地上，就能自动发出报警声。
Warning: Switch off main power supply before maintenance!
警告：维护前请先切断主电源！
Warning: Switch off main power supply before maintenance!
警告：维护前请先切断主电源！
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