1、protect
保护；防护
So, what can women do to protect themselves from heart disease?
那么，女性怎样做才能使自己不得心脏病呢？
A long thin wool coat and a purple headscarf protected her against the wind.
一件薄薄的羊毛长外套和一条紫色的头巾为她挡了风。
（保险单）为…提供保险
Many manufacturers have policies to protect themselves against blackmailers.
许多厂家都购买了保险，以防遭到敲诈。
2、extinction
（物种的）灭绝
An operation is beginning to try to save a species of crocodile from extinction.
一项努力拯救一个鳄鱼物种、使其免于灭绝的行动已经开始。
Many species have been shot to the verge of extinction.
很多物种已经被猎杀到灭绝的边缘。
消亡;消灭;不复存在
The loggers say their jobs are faced with extinction because of declining timber sales.
伐木工人说由于木材销量下降，他们的工作恐不复存在。
3、vulnerable
脆弱的;易受伤害的
Old people are particularly vulnerable members of our society.
老年人是社会中尤为明显的弱势群体。
易感染（某种疾病）的；易患病的
People with high blood pressure are especially vulnerable to diabetes.
有高血压的人尤其易患糖尿病。
Plants that are growing vigorously are less likely to be vulnerable to disease.
生命力强的植物不容易得病。
易受伤害的;易受影响的
Their tanks would be vulnerable to attack from the air.
他们的坦克易受到空袭。
a table showing which cars are most vulnerable to theft.
易被盗车辆一览表