?
查询技巧:
1、输入单个单词准确查询。
2、使用%模糊查询,匹配任意长度字符:
   %a    以a结尾的单词;
   ab%    以ab开头的单词;
   %ac%    含有ac的单词。
3、使用_模糊查询,匹配单个任意字符:
   _a_    三位且a在中间的单词;
   _ad    三位且ad结尾的单词;
   ac_    三位且ac开头的单词;
   _a    两位且a结尾的单词;
   a_    两位且a开头的单词。
4、带连字符-的单词,需含-字符才能模糊查询,如well-know需输入 well-% 。
5、在手机键盘上,如果g上有%和v上有_,则可长按输入。

become extinct

美 / bɪˈkʌm ɪkˈstɪŋkt /
灭绝;绝种;灭亡

1. At the current rate of decline, many of the rain forest animals could become extinct in less than 10 years.
按照目前的下降速度,许多雨林动物不到十年就会绝种。
2. We must protect these endangered animals before they become extinct.
在这些濒危动物灭绝之前,我们必须保护它们。
3. They will tum out to be the second-largest species of birds to become extinct.
它们将成为第二大灭绝的鸟类。
4. If these great cats become extinct, the smaller animals they prey upon will overpopulate the forests.
如果这些大型猫科动物灭绝了,那么它们捕食的小型动物将会使森林中物种的密度过高。
5. Cases in which many species become extinct within a geologically short interval of time are called mass extinctions.
许多物种在地质上很短的时间间隔内灭绝的情况称为大灭绝。