lactein

例句：

1. 1. Lactein is a type of protein found in milk and dairy products.
   乳清蛋白是一种存在于牛奶和乳制品中的蛋白质。
2. 2. The body needs lactein to maintain its health and function properly.
   身体需要乳清蛋白来维持健康并正常运作。
3. 3. Lactein supplements are often used by athletes to improve their recovery time after intense workouts.
   运动员经常使用乳清蛋白补充剂来改善他们在高强度训练后的身体恢复时间。