此图描绘的是针周围的热如何扩展到周围，形成一个热球？
Drawing depicts how the heat expands into the surrounding needles to form a thermal sphere.
风速的测定常用的仪器有杯状风速计、翼状风速计、卡他温度计和热球式电风速计。
It is a portable intelligent instrument mainly for low wind velocity, combined with the function for the measurement of wind temperature and relative humidity.
75亿年后不断膨胀的太阳已成红巨星，并将完全吞噬地球。听起来很吓人那我们能躲过这团热球吗？
Around 7.5 billion years, the expanding sun, now a red giant, will engulf the earth entirely, Sounds bleak, so can we avoid this hot mass?
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