Read the passage and circle the inventions on the right.
读文章并圈出右边的发明物。
Hot air circle device can evenly send hot air to everywhere of sealed space by inside passage, to control the internal temperature and gradient in sealed space.
热空气循环系统将热空气通过内部风道均匀送到封闭空间的每个地方，严格控制封闭空间内的温度及温度梯度。
Circle new words and phrases in the passage. Try to comprehend the meaning via drawing inferences from the storyline.
从课文中画出生字生词，并尝试推断词义。若无法理解，查询词典。
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