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MG hom ob lub lauj kaub tais diav ntim ntawm crane, crane roob ris, trolley travey ncig teb chaw, cab thiab hluav taws xob tswj, Lub trolley txav tau ntawm horizontally ntawm ib khub ntawm txoj kab ntawm lub nqaj. Alarm siv rau kev khiav hauj lwm, nrog rooj zaum sab hauv.
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