twice as [adj] as [noun]
This bag is twice as heavy as that one.
这个包是那个包的两倍重。
两倍；加倍；数量、强度或程度加倍；程度加倍；两倍
两次
Two times.
两次
two times
数量、强度或程度加倍
Doubled in quantity, intensity, or degree.
程度加倍
to double the degree
I have read this book twice, and I still enjoy it.
这本书我读了两遍，还是很喜欢。
用法提示：twice 是副词，表示动作“读”发生了两次。
AI contextual example
She called me twice yesterday but I was in a meeting.
她昨天给我打了两次电话，但我在开会。
用法提示：twice 作副词，修饰动词 called，说明打电话的次数是两次。
AI contextual example
He visits his grandmother twice a month.
他每个月去看望奶奶两次。
用法提示：twice 作副词，与 a month 搭配表示频率“每月两次”。
AI contextual example
This bag is twice as heavy as that one.
这个包是那个包的两倍重。
twice 常放在动词后表示动作重复两次。
I knocked twice before entering.
我敲了两次门才进去。
She exercises twice a week.
她每周锻炼两次。
grammar · medium
易错句子I have visited Paris two times.
正确表达I have visited Paris twice.
用“two times”代替“twice”不自然；英语中“twice”是标准表达，更简洁地道。
grammar · medium
易错句子I have been there for twice.
正确表达I have been there twice.
频率副词前不需要介词“for”，直接使用“twice”即可。
twice是副词，表示‘两次’或‘两倍’，修饰动词或形容词；double可作形容词、动词、名词，表示‘双倍的’或‘使加倍’，词性不同。
twice表示‘两次’，once表示‘一次’，两者是次数上的对比。
两倍多
This bag costs twice as much as that one.
这个包比那个贵两倍。
每周两次
I go to the gym twice a week.
我每周去两次健身房。
三思而行
You should think twice before quitting your job.
你应该三思而后行再辞职。
一两次
I've only been there once or twice.
我只去过那里一两次。
两倍数量
She has twice as many books as me.
她的书是我的两倍。
每日两次
Take this medicine twice daily.
这种药每日服用两次。
表示次数，与twice同为频率副词
表示重复，与twice语义相关
表示两倍，与twice的数字概念相关
表示多次，与twice同属次数范畴
表示三次，与twice为同类次数表达
三思而行
You should think twice before making such a big decision.
在做出如此重大的决定之前，你应该三思而行。
一朝被蛇咬，十年怕井绳
He won't invest in that company again; once bitten, twice shy.
他不会再投资那家公司了；一朝被蛇咬，十年怕井绳。
量两次，裁一次（指做事要谨慎）
In woodworking, it's important to measure twice, cut once to avoid mistakes.
在木工中，量两次、裁一次很重要，以避免错误。
量两次，切一次。
I always measure twice before cutting the wood.
我总是在切木头前量两次。
骄傲两倍，堕落双倍。
He learned the hard way that twice the pride means double the fall.
他吃一堑长一智，明白了骄傲两倍意味着堕落双倍。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.