| So they lick saliva onto their forearms where there is a network of blood vessels close to the surface of the skin and, as the saliva evaporates, their blood is cooled. This thermal image shows just how effective the process is. The blue areas on the body are the cooler parts. As the saliva dries it has to be replaced and this is a real drain on the kangaroo's body fluids. Even in the shade the earth is baking hot so the kangaroos dig away the warmed topsoil to get at the cooler ground beneath. By staying in the shade and licking to control their body temperature kangaroos manage to get through the hottest part of the day without heat stroke. | |
| 所以，它们用唾液给自己的手臂降温，因为手臂上有靠近皮肤表面的血管，唾液蒸发的同时，血液也同时得以冷却，这张热敏图，清楚显示出这个过程的效果，身体的蓝色区域温度明显降低，唾液蒸发之后必须继续补充，这构成了袋鼠体液的排放过程，即使是在树荫下地面也是灼热的，所以袋鼠刨掉地面干热的表层，以便接触到下面较凉爽的部分，躲到树荫下，舔自己的皮肤来降温，袋鼠通过这些办法，度过一天中最热的时间，而没有中暑。 |
| So they lick saliva onto their forearms where there is a network of blood vessels close to the surface of the skin and, as the saliva evaporates, their blood is cooled. This thermal image shows just how effective the process is. The blue areas on the body are the cooler parts. As the saliva dries it has to be replaced and this is a real drain on the kangaroo' s body fluids. Even in the shade the earth is baking hot so the kangaroos dig away the warmed topsoil to get at the cooler ground beneath. By staying in the shade and licking to control their body temperature kangaroos manage to get through the hottest part of the day without heat stroke. | |
| suo yi, ta men yong tuo ye gei zi ji de shou bi jiang wen, yin wei shou bi shang you kao jin pi fu biao mian di xue guan, tuo ye zheng fa de tong shi, xue ye ye tong shi de yi leng que, zhe zhang re min tu, qing chu xian shi chu zhe ge guo cheng de xiao guo, shen ti de lan se qu yu wen du ming xian jiang di, tuo ye zheng fa zhi hou bi xu ji xu bu chong, zhe gou cheng le dai shu ti ye de pai fang guo cheng, ji shi shi zai shu yin xia di mian ye shi zhuo re de, suo yi dai shu pao diao di mian gan re de biao ceng, yi bian jie chu dao xia mian jiao liang shuang de bu fen, duo dao shu yin xia, tian zi ji de pi fu lai jiang wen, dai shu tong guo zhei xie ban fa, du guo yi tian zhong zui re de shi jian, er mei you zhong shu. |
| So they lick saliva onto their forearms where there is a network of blood vessels close to the surface of the skin and, as the saliva evaporates, their blood is cooled. This thermal image shows just how effective the process is. The blue areas on the body are the cooler parts. As the saliva dries it has to be replaced and this is a real drain on the kangaroo' s body fluids. Even in the shade the earth is baking hot so the kangaroos dig away the warmed topsoil to get at the cooler ground beneath. By staying in the shade and licking to control their body temperature kangaroos manage to get through the hottest part of the day without heat stroke. | |
| suǒ yǐ, tā men yòng tuò yè gěi zì jǐ de shǒu bì jiàng wēn, yīn wèi shǒu bì shàng yǒu kào jìn pí fū biǎo miàn dí xuè guǎn, tuò yè zhēng fā de tóng shí, xuè yè yě tóng shí dé yǐ lěng què, zhè zhāng rè mǐn tú, qīng chǔ xiǎn shì chū zhè gè guò chéng de xiào guǒ, shēn tǐ de lán sè qū yù wēn dù míng xiǎn jiàng dī, tuò yè zhēng fā zhī hòu bì xū jì xù bǔ chōng, zhè gòu chéng le dài shǔ tǐ yè de pái fàng guò chéng, jí shǐ shì zài shù yīn xià dì miàn yě shì zhuó rè de, suǒ yǐ dài shǔ páo diào dì miàn gān rè de biǎo céng, yǐ biàn jiē chù dào xià miàn jiào liáng shuǎng de bù fèn, duǒ dào shù yīn xià, tiǎn zì jǐ de pí fū lái jiàng wēn, dài shǔ tōng guò zhèi xiē bàn fǎ, dù guò yì tiān zhōng zuì rè de shí jiān, ér méi yǒu zhòng shǔ. |
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