如果你不努力工作，你会落伍的。

If you don't work hard, you will fall behind the ranks.

她因为生病而在训练中落伍了。

She fell behind the ranks in training because of illness.

他在学习上落伍了，需要更多的帮助。

He has fallen behind the ranks in his studies and needs more help.

这个项目进展缓慢，已经落伍于计划。

The project is progressing slowly and has fallen behind the ranks of the schedule.

他在技术上落伍了，需要学习新的技能。

He has fallen behind the ranks in technology and needs to learn new skills.

欧战以后, 德国落伍了.

After the first World War, Germany fell behind.

落伍的终端需要升级。

The outdated terminal needs to be upgraded.

汽油引擎已经落伍了。

Gasoline-powered engines are obsolete.

哈哈，你真是落伍了啊。

Tom: Ha-ha, you are out.

不懂因特网让我感觉很落伍。

Not knowing about the internet makes me feel so premodern .