tight和firm的区别

tight是紧的意思，而firm是结实的意思，区别可以从以下例子看出：

After years exercise, his skins are very tight and body is firm, he looks very fit and healthy, that is the result of exercise.

经过多年的锻炼，他的皮肤很紧，身体很结实，看起来很健康，这就是锻炼的结果。