The salt was used to preserve meat which began to be traded in large quantities in the late stone age.

在当时的晚石器时代，盐被用作保存肉食，并拿这些肉食做大量交易。

There preserved meat, biscuit, and tea made us an excellent meal, one of the best I ever remember.

腌肉、饼干和茶为我们提供了一顿美餐， 是我记忆中最好的一顿饭之一。

It was needed to flavor food and preserve meat for the return trip.

回程时需要它来调味食物和保存肉类。

In fact, medieval Europeans avoided rancid foods and had methods for safely preserving meats, like curing them with salt.

事实上，中世纪的欧洲人避免食用腐臭的食物， 并有安全保存肉类的方法，比如用盐腌制它们。