You shouldn't eat your food in a big rush. 你吃饭不该吃得那么急。
in a rush 急忙地
解说:in a rush 是口语用法,表「急急忙忙地」,与 in a hurry 意思相似。而 in a big rush 表「非常匆忙」;there's no rush 则表「不急」。