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2. navigate v. 给(船舶、飞机等)引航;导航
例句：The ship was navigated by the North Star.
那只船靠北极星来导航。

3. alleviate vt. 减轻, 缓解, 缓和
例句：The doctor gave her an injection to alleviate the pain.
医生给她注射以减轻疼痛。

4. incredible adj. 难以置信的;惊人的;极妙的
例句：For such a tiny woman she had an incredible appetite.
对这么一个小个子女人来说,她的胃口大得令人难以置信。

5. accelerate vt. (使)加快, (使)增速
例句：Our country should accelerate the economic growth.
我国应加快经济增长。

6. concept n. 概念,观念,思想
例句：He presented a new concept of the beginning of the universe.
他提出了一种宇宙起源的新概念。

7. identify vt. 认出, 识别
例句：She identified her son among a lot of children.
她在许多孩子中认出了自己的孩子。

8. distribution n. 分发;分配;配给物
例句：They could not agree about the distribution of the profits.
他们无法就利润分配一事达成协议。

9. alert n. 警戒，戒备，警惕，警报
例句：The whole navy was placed on full alert.
整个海军都处于全面戒备状态。

10. available adj. 可用的或可得到的；可会见的, 可与之交谈的
例句：My bicycle is not available, and it is being repaired.
我的自行车现在不能用, 因为正在修理。