Long time walking or standing with a heavy load will expend a lot of physical energy, and even harm the health.
长时间负重行走或站立对人的体力消耗很大，甚至危害身体健康。
Tests have proved that the device can effectively reduce the physical consumption on walking or standing with a heavy load.
多次试验证明，该装置能有效减轻肩部负重行走或站立带来的体力消耗。
Tests have proved that the device can effectively reduce the physical consumption on walking or standing with a heavy load.
多次试验证明，该装置能有效减轻肩部负重行走或站立带来的体力消耗。
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