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1.
他们一直在用小麦交换棉花和木材。
They have been bartering wheat for cotton and timber.
《柯林斯英汉双解大词典》
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2.
他和他的支持者们一直在用的口号是“统一”。
The catchword he and his supporters have been using is "consolidation."
《柯林斯英汉双解大词典》
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3.
最近我一直在用功读书。
I've been hitting the books these days.