1. There are 1000 grams in a kilogram.
    一公斤等于一千克。

2. There are 1 , 000 grams in a kilogram , which is the metric way of saying how heavy something is.
    一公斤分为一千克，这是表示重量的十进制方法。

3. One kilogram of beef requires 7 kilograms of grain. People, therefore, may eat less red meat in the future and more fish.
    生产1公斤牛肉需要7公斤谷物。因此，人们在将来可能会少吃红色肉类，多吃鱼类。

4. Fish farming is very efficient: producing a kilogram of fish utilizes less than 2 kilograms of feed, but it takes 2.2 kilograms of feed to produce 1 kilogram of chicken.
    养鱼场的生产效率相当的高：生产1公斤鱼类只需要不到2公斤的饲料，而生产1公斤鸡肉需要2.2公斤的饲料。