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情景会话1 好友在升级电脑
Alex: Should I back up my files before updating the software? （我在更新软件之前应该备份文件吗？）
Zoey: Definitely. Better safe than sorry.（当然应该。小心驶得万年船。）
情景会话2 好友Peggy行事谨慎
Zoey: Do you really need to lock the door every time you leave, even if it's just for a minute? （你每次离开都需要锁门吗，即使只是离开一分钟？）
Peggy: Absolutely. Better safe than sorry.（当然需要。宁可安全也不要后悔。）
