1. He's familiar with doing business in the US.
(他对在美国做生意熟门熟路。)
2. There is certainly a learning curve associated with doing so.
这只是学习曲线的问题。
3. Isn't that a good thing to achieve the great with doing little?
这岂不是一件四两拨千斤的大好事。
这些都是表主动但不表示进行的。在特定语境下可以表示进行。
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