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一半天

yi1 ban4 tian1

• in a day or two; soon

一卡通

Yi1 ka3 tong1

• the name of various contactless smart cards, notably Yikatong (mainly for public transport in Beijing) and iPASS (mainly for public transport in Taiwan)

一去不回

yi1 qu4 bu4 hui2

• gone forever

一去不复返

繁体：一去不復返

yi1 qu4 bu4 fu4 fan3

• gone forever

一去无影踪

繁体：一去無影蹤

yi1 qu4 wu2 ying3 zong1

• gone without a trace

一反常态

繁体：一反常態

yi1 fan3 chang2 tai4

• complete change from the normal state (idiom); quite uncharacteristic
• entirely outside the norm
• out of character

一反往常

yi1 fan3 wang3 chang2

• contrary to what usually happens

一口

yi1 kou3

• readily
• flatly (deny, admit and so on)
• a mouthful