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It is only by constant practice that you can learn a foreign language.
只有不断练习，才能学会一门外语。
youdao
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A good command of English can only be gained by constant practice.
只有不断地实践才能对英语应用自如。
youdao
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A good command of English can only be gained by constant practice.
只有不断地实践才能对英语应用自如。
youdao