1) A northwest wind is blowing.

正刮西北风。
2) The wind was blowing northwest.

正在刮西北风。
3) The wind is blowing from the north.

正刮着北风。
4) The wind sits in the west.

正在刮西风。
5) A north wind was blowing.

正在刮着北风。
6) There was a west wind blowing.

当时正刮着西风。
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