?
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。

heating system
TOEFL

美 / ˈhiːtɪŋ ˈsɪstəm /
un. 供暖系统;供热系统

1. High electricity bills point to a poor heating system or bad insulation.
高额的电费账单表明供暖系统较差或者是隔热材料不好。
2. You will need to drain the central heating system before you replace the radiator.
你得先把中央供暖系统的水排净再更换散热器。
3. He had the heating system replaced right away.
他马上换了暖气系统。
4. But he had the heating system replaced right away.
但他马上换了暖气系统。
5. In another firm the workers were constantly complaining about the malfunctioning heating system, but the owners was too busy or too mean to do anything about it.
在另一家公司,工人们不停地抱怨出故障的供暖系统,但老板们太忙或太刻薄,对此不予置喙。