例句：He was very mysterious in his manner.
      他的行为举止十分神秘。

2.trail n.踪迹,痕迹,一串,尾部,小径,尾,持枪姿势

例句：The car left a trail of exhaust fumes.
      车子留下废气的痕迹

3.vapor n.水汽,水蒸气

4.solid adj.可靠的

例句：I know that James is a solid type of person.
      我知道詹姆斯是个可信赖的人。

5.contrail n.飞行云,轨迹

6.accelerate vt.vi.(使)加快, (使)增速

例句：The car suddenly accelerated.
      汽车突然加速。

      Our country should accelerate the economic growth.
      我国应加快经济增长。

7.deviate vi.偏离; 越轨

例句：His statements sometimes deviated from the truth.
      他的陈述有时偏离事实。
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