1.bound to 一定會；束縛于

This scandal is bound to tell against him in the coming presidential election.
在即將到來的總統競選中這一丑聞必然對他不利。

He could draw men round him and keep them bound to him; while his powerful attraction was there, disruption was out of the question.
他能夠把人們吸引到他的周圍而且保持他們的忠心；而他的強大吸引力所在之處，就不可能有分裂。

2.sign up 簽約雇用，簽約參加

If you feel strongly enough about it that you want to sign up, copy it.
如果你對其有足夠強烈的感覺，以至于想要簽署它，那么就復制它。

We have built enough liveboards to permit casual use: they have been placed in ordinary conference rooms and open areas, and no one need sign up or give advance notice before using them.
我們已經構建了足夠多的現場板允許偶爾使用：他們被放置于普通的會議室和開放區域，在使用前不需要簽名或者提前予以注意。

3.economic growth 經濟增長，經濟成長

The economic growth dipped to a low point last year.
去年經濟增長速度降至低點。

Modern technology catalyzed tremendous economic growth in China.
現代技術促成了中國經濟的巨大發展。

4.refer to 參考；涉及；指的是

He never referred to his sisters in his letters.
他在信里從未提到過他的姊妹。

They referred their plan to the management.
他們將計劃提交管理部門。