... "完全掌握" - fully mastered 大部分掌握 - mostly mastered 部分掌握 - partly mastered ...
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mostly mastered
基本上掌握了
以上为机器翻译结果，长、整句建议使用 人工翻译 。
They tend to grow quickly, perhaps because they have mastered industries that are mostly the preserve of richer, and therefore costlier, rivals.
ECONOMIST: Economics focus
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