求翻译：1和2是两种不同材质的金属片.将两者焊在一起.叫做双金属片.由于两种不同材质金属片的热膨胀系数不同.当温度升高时.金属片2伸长较少.金属片1伸长较多.迫使双金属片向下弯曲.使动触点3与靜触点4闭合.接通电路.当温度下降时.双金属片恢复原来的形状.使动触点3与静触点4断开.断开电路.达到自动控制温度的目的.是什么意思？

1 and 2 is a metal sheet in two different materials and the two are welded together. Called double metal sheet due to the different thermal expansion coefficients of two different materials of the metal sheet when the temperature rises, the metal sheet 2 is elongated less. the metal sheet 1 is elong

1 and 2 are two different materials of the sheet metal of the two would be welded, in a play called "bi-metal blade . . Result of two different materials of the piece of metal from different thermal expansion coefficient when the temperature rises, the piece of metal 2 stretch, a little piece of met

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1 and 2 is two species different material of metal tablets. will both welding in together. called double metal tablets. due to two species different material metal tablets of hot expansion coefficient different. Dang temperature rise Shi. metal tablets 2 elongation less. metal tablets 1 elongation m

1 and 2 is two kind of different material quality tinsels. Welds both in the same place. Is called the bimetal piece. Because two kind of differen