地球中还有其他不那么容易开采的燃料，如焦油砂，以及更引入注目的可燃冰。
The Earth holds other, less-accessible fuels, such as tar sands, and a more exotic possibility in the form of icy methane hydrates.
香烟中所含有的化学药品，如焦油和甲醛会渗透到细胞中，损伤dna。
Chemicals such as tar and formaldehyde within tobacco smoke penetrate the cells and damage DNA.
他说，这类行星可能少水，这样的话温度就会非常高，其表面可能就会有多碳的液态化合物，如焦油等。
These planets would be lacking in water So, if temperatures were sufficiently high, liquid on their surface would consist of carbon-rich compounds, such as tar, he says.
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