On Wednesday, a polar wind brought bitter cold to the Midwest.
周三，一股极地风给中西部地区带来了刺骨的严寒。
2
For example, birds may expend more of their reserves on thermoregulation if they spend the night exposed to the windona song post than if they are in a sheltered roost site.
例如，与在有遮挡的栖息地的鸟类相比，如果鸟类在风中露宿一晚，它们可能会更多地利用体温调节。
3
If there was awind blowing on the candle, it burned too quickly.