1. Duff soon mastered the skills of radio production. 达夫很快掌握了广播节目制作的技能。
2. They have never mastered fire nor progressed. "它们从来没有掌握过火的使用,也不存在任何进展。
3. I've completely mastered the use of all the words I've learned. 学过的词汇我全部掌握了。
4. Mastered by his better self he would have returned reluctantly up the tree, but for one thing. 如果不是因为他可以更好的掌握自己,他会不情愿地回到树上,但有一件事是肯定的。
5. Even if ET has mastered building a rocket that can travel at the speed of light, he may be lying dead inside a weakened craft . 即使外星人已经掌握了制造一枚能以光速飞行的火箭的技术,他也可能死在了一架飞船里。