He strained his right arm by lifting a heavy bag just now.
他刚才抬一个重包的时候扭伤了右臂。
Simple arm frame gantry crane structure, lifting large light weight.
单臂架门座式起重机结构简单、起重量大自重轻。
Right arm curving top left, simultaneously left knee lifting toward right elbow.
右臂向左上方弯曲，同时左膝抬向右肘。
Right arm curving top left, simultaneously left knee lifting toward right elbow.
右臂向左上方弯曲，同时左膝抬向右肘。
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