?
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。

ascertained
CET6

v. 确定(ascertain 的过去式);查明

1. It must be ascertained if the land is still owned by the government.
必须确定这块土地是否仍属于政府所有。
2. Once they had ascertained that he was not a spy, they agreed to release him.
一查明他不是间谍,他们就同意了释放他。
3. Traditionally the relatedness of species has been ascertained by a close comparison of their anatomy.
传统上,物种的亲缘关系是通过对它们的解剖结构的密切比较来确定的。
4. I ascertained that the driver was not badly hurt.
我已查清,驾驶员伤势不重。
5. It should be ascertained that the plans comply with the law.
须要弄清楚,这些计划要合法。