Some hydrocarbons are lightweight molecules that evaporate easily.Others are heavier, have a tendency to form deposits and particulates, and may be cancer-causing.

• 有一些碳氢化合物是容易挥发的轻量分子，其他碳氢化合物重一些，有形成沉积物和微粒的趋势，并可能引起癌症。