1.bound to 一定会；束缚于

This scandal is bound to tell against him in the coming presidential election.
在即将到来的总统竞选中这一丑闻必然对他不利。

He could draw men round him and keep them bound to him; while his powerful attraction was there, disruption was out of the question.
他能够把人们吸引到他的周围而且保持他们的忠心；而他的强大吸引力所在之处，就不可能有分裂。

2.sign up 签约雇用，签约参加

If you feel strongly enough about it that you want to sign up, copy it.
如果你对其有足够强烈的感觉，以至于想要签署它，那么就复制它。

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.
我们已经构建了足够多的现场板允许偶尔使用：他们被放置于普通的会议室和开放区域，在使用前不需要签名或者提前予以注意。

3.economic growth 经济增长，经济成长

The economic growth dipped to a low point last year.
去年经济增长速度降至低点。

Modern technology catalyzed tremendous economic growth in China.
现代技术促成了中国经济的巨大发展。

4.refer to 参考；涉及；指的是

He never referred to his sisters in his letters.
他在信里从未提到过他的姊妹。

They referred their plan to the management.
他们将计划提交管理部门。