英语语法分析

So weak does the body's immune system become that the person often becomes very ill from usually mild sicknesses.

身体的免疫系统变得如此脆弱，以至于人们经常因为轻微的疾病而变得非常虚弱。

The children didn't have childhood sicknesses.

孩子们没得儿童病。

Malnourished children are more prone to sicknesses and diseases, such as measles.

营养不良的儿童更容易染病，比如麻疹。