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1·He could not understand how people paid for food and valuable things with paper! He was also puzzled by the black stones people used to burn to produce heat.

他不明白人们是怎么用纸来买食物和贵重物品的！他还对人们用来燃烧产生热量的黑色石头感到困惑。

2·Chinese people used black stones to produce heat.

中国人用黑色的石头来产生热量。

3·He was also puzzled by the black stones people used to burn to produce heat.

他还对人们用来燃烧产生热量的黑色石头感到困惑。

4·The intense heat of the impact would produce heat-shocked quartz in many types of rock.

撞击所释放的强烈高温会在许多类型的岩石中形成一种热冲击石英。

5·The light of the firefly does not produce heat.

萤火虫的光不能产生热量。

6·The light of the firefly does not produce heat.

萤光灯较白炽灯省电且发热少。

7·The principle of solar energy: focus on a focal point to produce heat.

⊙、太阳能的原理：集中在一个焦点上才能产生热。

8·Utilizes far infrared ray electrothermal film to produce heat, safe and reliable.

使用远红外线发热膜产生热量，更安全、可靠。

9·Other bloodsuckers like bedbugs produce heat shock proteins too-as do we, during a fever.

其他吸血动物如臭虫也会产生热休克蛋白——我们在发烧的时候也一样。

10·Other bloodsuckers like bedbugs produce heat shock proteins too-as do we, during a fever.

其他吸血动物如臭虫也能产生热休克蛋白质- - -我们发烧时也一样。