指出，隧道内无阳光照射，气温变化小，空气流动性差，阴暗潮湿的环境有利于微生物生长繁殖，并可能影响隧道内作业工人、列车司乘人员和旅客的身体健康。
In tunnel, there had no sunshine, temperature' change was small, and the mobile air was little. So the environment was suitable for the growth of bacterium. It was bad for human's heath.
更糟的是，这个数据只是平均数而已，真实的气温在不同地区的变化各有所差异，造成的影响也有大有小。
What's more, this is just an average, with actual temperatures rising at different rates, and with varying impacts, around the world.
气温和降水在不同时间尺度上的小波系数变化曲线图揭示了气候的长期和短期变化趋势有很大不同。
The wavelet coefficient curves of temperature and precipitation on different time scales reveal that the long periodical variation trend is quite different from the short.
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