动词短语
中文翻译：练习焊接
同义词：
['practice', 'work on', 'practice on']
例句：
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1. Hehas been practicing welding for years.
他已经练习焊接多年了。
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2. Thecarpenter is workingon the roof of the house.
木匠正在修理房子的屋顶。
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3. Weneed to practice more before we can dothis job well.
我们需要多加练习才能做好这项工作。