at a dash的用法和样例：
- So we believe she once was invigorated by this one pure place, went at a dash.
- The tiger in the cage gnawed listlessly at a bone.
- He will sell his house at a sacrifice because he needs money.
- A variety of food is sold at a supermarket.
- A live band is always a good draw at a party.
- At a distance of six miles you can't see much.
- make a dash at 向 ... 猛冲