復合 ：be back together
無縫接軌： on a rebound relationship
備胎：a backup；a second boyfriend；a second girlfriend
備案：a backup；a plan B
本日例句：
1） Less than a month after his bad breakup, Jim is on a rebound relationship
＝ Less than a month after his bad breakup, Jim rebounded with a new girlfriend.
才剛分手一個月，吉姆就無縫接軌，交了一個新女友。
2）I think that she is just his rebound after his breakup.
備胎 (BACKUP) It seems like Tina always has a backup/second boyfriend.
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