重点讲解：
1. touch down 降落；着陆；
Spacecraft Columbia touched down yesterday.
“哥伦比亚”号宇宙飞船昨天着陆9o5_[CdG1M~ZiazIrT。
2. turn out 结果发现；
Cosgrave's forecast turned out to be quite wrong.
科斯格雷夫的预测最后证明是大错特错P=vq7.XA5_B。
3. because of 因为；由于；
Many families break up because of a lack of money.
许多家庭由于缺钱而破裂2~)+Qr7dsT+8_5HAwhI。
4. carry out 实施；执行；实行；
Frank was carrying out fuel-system tests which necessitated turning the booster pumps off.
弗兰克在做燃料系统测试，这一测试需要关掉升压泵d-sj+6U,;c。