?
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。

not often

不经常;不常;不大

1. Sometimes, though not often, he had dreams, and they were more painful than the dreams of other boys.
有时,尽管不是经常,他会做梦,而且比其他孩子的梦更痛苦。
2. It is not often that you get such an opportunity.
你得到这样的机会,可不是常有的事。
3. It is not often that you get such an opportunity to be an exchange student.
你得到成为交换生这样的机会,可不是常有的事。
4. If you dream about some particular subject, it is not often that the dream is about that thing.
如果你梦到某个特定的主题,这并不是说梦就与那件事情有关。
5. The pilosus is a plant not often seen.
毛轴莎草是一种不太常见的植物。