英语问题：用concurrent造3个句子，每句5分，好句子再加5分

You can't attend two concurrent events!
你不能同时参加两项活动！

The twins had concurrent birthday.
双胞胎生日在同一天。

The concurrent operation of more than one path of execution within a computer.
在一台计算机内使多条执行路径进行并行操作的技术。