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。
Five: feeder, the feeder is very important, we must choose good, and we want to know the general antenna distance can't more than 50 m, or receiving signal will become weak.
五：馈线，这个馈线很重要的，我们必须要选择好，而且我们要知道一般的天线距离不能超过50米，要不然接收的信号就会变弱。
When the skybridge rigidity is weak comparing with that of the buildings, the wind vibration analysis and wind resistant analysis become very important in the design of skybridge.
因此当连廊的刚度与主体建筑刚度相比较弱时，连廊的风振分析与抗风设计往往成为设计中的关键问题之一。
But as they get older and their cognitive development progresses, children become painfully aware that they are very weak, little people in a very large and sometimes rather scary world.
但当他们渐渐长大，认知有所发育时，他们会悲哀的意识到自己的脆弱，一个小小人儿面对巨大的，有时是颇为凶险的世界。
Eventually, the immune system becomes so weak that the infected person can become sick very easily, and even common illnesses like the flu can be quite serious.
最终，免疫系统变得相当脆弱，被感染的人就很容易生病，即使是最平常的病，比如流感，也会变得非常严重。
Eventually, the immune system becomes so weak that the infected person can become sick very easily, and even common illnesses like the flu can be quite serious.
最终，免疫系统变得相当脆弱，被感染的人就很容易生病，即使是最平常的病，比如流感，也会变得非常严重。
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