sus-,在下，向上，-tain,持，握，词源同 contain,tenure.引申诸相关词义。

1. There's a sufficiency of drama in these lives to sustain your interest.

这些人的生活充满了戏剧性，总能让你兴趣盎然。

2. Their defense markets are too small to sustain economically viable production runs.

他们的国防市场太小，就经济可行性而言不足以维持生产。

3. The people who sustain the worst losses are usually those who overreach.

不自量力者往往摔得最惨。

4. Naivety bordering on obtuseness helped sustain his faith.

近乎鲁钝的天真使他坚守自己的信仰。

5. Which planets can sustain life?

哪些行星可以维持生命的存在？