Steel parts are usually covered with grease for fear that they should rust.

钢制零件通常涂上润滑脂，以防生锈。(为了防锈，钢制零件通常需涂上润滑脂。)

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Steel parts are usually covered with grease for fear that they should rust.

钢制零件通常涂上润滑脂，以防生锈。(为了防锈，钢制零件通常需涂上润滑脂。)

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