雅思小作文解析及范文:保温瓶奏效的信息
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Task：The information of how a thermos flask works.
思路解析：
1. 静态流程图的特点在于对于一个物体的细节描述，可采用顺序描述，eg.由内至外，由外至内，由上至下等。
2. 注意对于功能原理的阐述。eg，vaccum是一种不良导体，它会保持热量，而不是传导。
3. 注意物体形状和轮廓的描述。
参考范文：
The diagram indicates the structure and working process of a thermos flask.
The thermos flask is used to keep the liquids and remain the temperature. Its most common use is to keep hot drinks, for example coffee, hot but you can also use it to keep things like milk cold.
A thermos flask is a cylinder-shaped object between 30 and 40 cm high. The inside of the thermos flask is a flask made of glass. There is nearly no air inside this glass, so it is a very poor conductor. In addition, the glass is silvered, which reduces infrared radiation. This vacuum flask is surrounded by another cylinder made of metal or plastic, which protects the fragile glass inside.
The top is a plug or cap, usually made of cork or plastic, which is covered by a plastic cup. This is taken off and used to drink the liquid from. Some heat escapes from the cap but the special design of the thermos flask means that liquid maintains its temperature for several hours.
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