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在二次分型机构的作用下，模具工作自如。
Under the action of the twice-parting mechanism, the die works well.
youdao
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二次型理论有着十分广泛的应用。
The theory of quadratic form is of very extensive application.
youdao
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二次型理论有着十分广泛的应用。
The theory of quadratic form is of very extensive application.
youdao