如何使用 "at" 造句

1. Our nation is at war .
我们的国家在战争。
2. Wearing sunglasses only at midday .
只在中午戴太阳镜。
3. Multiple forces are at work .
多种力量在起作用。
4. Eat at home most nights .
晚餐在家里吃。
5. But there is more at stake .
但问题还不止于此。