sickness是sick的名词形式。例句：The disease causessicknessand diarrhoea.这种疾病会引起呕吐和腹泻。
双语例句
1.The contributions employees pay give cover against sickness, including chronic invalidity.
雇员所交纳的保险费中含有疾病险，其中包括慢性病。
2.She suffered badly from morning sickness.
她妊娠晨吐严重，十分难受。
3.We are withdrawing from some staff the facility to self-certify sickness absence.
我们将取消允许一些职员病假自证的做法。
sick例句
1.You've been protecting sick and perverted men.
你一直在保护那些有病的性变态者。
2.Are you sick?
你生病了吗？
3.That's really sick!
那太变态了！
4.I was sick with worry.
我担心得要命。
5.She was getting very sick of Mick's put-downs.
她越来越厌烦米克的风凉话了。