Threshing machines have greatly lightened farmers' work.
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Part of the harvest sequence: 收割 (harvest) → 打谷/脱粒 (thresh) → 晒谷 (sun-dry) → 扬场 (winnow) → 入仓 (store). 脱粒机 (threshing machine) replaced manual flails and stone rollers in most of rural China from the 1970s onward.