例句 /

US scientists want to change the current system, which keeps clocks in synch with solar time by adding a leap second every 18 months or so.

详情正文

登录后查看完整内容

使用 DeepEvidence / 梅斯账号登录,新用户可在登录页面注册。

登录成功后将返回当前页面,继续浏览。