?
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。

by accident
初中

美 / baɪ ˈæksɪdənt /
na. 偶然 (opp. on purpose)

1. Helen got into acting purely by accident.
海伦当演员完全出于偶然。
2. She discovered the problem by accident during a visit to a nearby school.
她在去附近一所学校参观时偶然发现了这个问题。
3. It happened—whether by accident or design —that the two of them were left alone after all the others had gone.
碰巧—不知是偶然还是有意安排—其他人走后,只剩下了他们两个人。
4. Success in life doesn't happen by accident.
生活的成功并不会是偶然发生的。
5. It was hard to know whether it happened by accident or by design.
很难知道这是偶然发生还是有意为之。