For instance, cover with the tobacco tar that the coconut burn queen produces in the mouse back, may come into the skin tumour.

例如，在鼠背涂上可可燃烧后产生的烟油，可长出皮肤瘤。

Tobacco smoke is hazardous because it contains a number of unhealthy chemicals, including some 60 carcinogens (cancer-causing agents), tar, arsenic, carbon monoxide and nicotine.

吸烟之所以危害健康是因为烟草中含有多种损害健康的化学物质，包括60来种致癌物质、烟碱、砷、一氧化碳和尼古丁。

As we all know, tobacco contains many toxic substances such as nicotine and tar.

正如我们所知，烟草中含有许多有毒物质，如尼古丁和焦油。

Other smokers believe that cigarettes with low tar levels are safer. Tar is a substance produced when tobacco leaves are burned. It is known to cause cancer.

另外一些吸烟者认为低焦油的的烟草更安全，焦油是烟叶燃烧时产生的一种物质，它以易引发癌症而著称。

The most important carcinogens in tobacco is tar, which contains large amounts of carcinogenic effects of a strong 34 Benzo a Pyrene.

烟草中最主要的致癌物质是煤焦油，它含有大量致癌作用很强的34苯并a芘。