Faith in yourself, your topic, and your general sanity is a must if you are to be a better public speaker.

要对你自己和你的主题有信心。如果你要做一个更好的公众演讲者你必须保持清醒的头脑。

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But begin you must if you wish to go further, and in order to begin you may need a break from being excellent.

如果你愿意去看看那样的生活，你就要向前迈进，首先要做的，就是可能要是你追求卓越的路上先休息一会。

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But it's easy to follow once you have the basics down; and understanding the formal syntax is a must if you want to master Derby.

但是有了基础之后，接下来就容易了；而且如果想掌握 Derby，对正式语法的理解是必需的。

youdao

He said the United States must build up its sea power,too, if it wanted to be a great nation.

VOA: special.2010.07.08

If the atom is fixed mass, the electron is tiny, It must be the positives have all the mass.

如果是原子质量一定，电子很小，带正电荷的部分几乎占据了全部质量。

麻省理工公开课 - 固态化学导论课程节选

And if it is going to be a standing wave then this must be an integral number of wavelengths.

如果这有个驻波的话,那么周长就是个整数。

麻省理工公开课 - 固态化学导论课程节选

China's own growth is slowing, as it must if inflation is to be checked.

ECONOMIST: Leaders

Meantime, the U.S. housing market is still sagging, as it surely must if prices are to adjust to post-bubble reality.

FORBES: A Bull Market's Blessed Isolation

Stereotyping does not help the good ones to work together, as they must if we are to repair the deficiencies in our societies.

ECONOMIST: Google's search for cash