1. It is a positive, silent sign sent with the hope the other person will smile back.
    这是一种积极的、无声的信号，发出这个信号的人希望别人也以微笑回报。

2. Investigations revealed no evidence of bad weather, no messages for help, no wreckage and no sign of the 309 men aboard.
    调查发现没有恶劣天气的迹象，没有求救信号，没有船只残骸，也没有船上309人的踪迹。

3. It is a sign, in short, of emotional intelligence. And it doesn't show up on an IQ test.
    简言之，这是情感智能的体现，而这是在智力测试里表现不出来的。

4. For example, when people who fear snakes are shown a picture of a snake, monitors attached to their skin will detect sweat, a sign of anxiety, even though the people say they do not feel fear.
    例如，当怕蛇的人看到蛇的画面时，在他们体表上安放的监控器会测到排汗，这是焦虑的迹象，即使他们说自己并未感到害怕。