神州9号与天宫1号再次对接

2. schedule vt. 安排,预定
例句：The delegation is scheduled to arrive tomorrow.
代表团定于明日到达。

3. launch n. 发射; (船)下水; (新产品)投产
例句：I saw the launch of the rocket yesterday.
我昨天看了火箭发射。

4. duration n. (时间的)持续,持久;持续期间
例句：The duration of the examination is three hours.
考试时间为三个小时。

5. assign vt. 指派, 选派
例句：The captain assigned two soldiers to guard the gate.
上尉派了两个士兵守大门。

6. undergo vt.经历, 承受
例句：This new plane is undergoing safety tests.
这架新型飞机正在接受安全试验。

7. retirement n. 退休;退职;退役
例句：She took to painting after retirement.
她退休后爱上绘画。

8. rank v. 列为
例句：They ranked high in their class.
他们是班上的优等生。

9. maintain vt. 保持；保存；维持
例句：The two countries have maintained friendly relations for many years.
两国多年来一直保持着友好的关系。

10. endeavor v. 尝试, 试图
例句：They endeavored to make her happy, but in vain.
他们想方设法地使她高兴, 但那是徒劳的。