1·People have been using natural oils as hair conditioners for centuries.
几百年来，人们一直使用天然油类作为护发素。
2·These natural oils include essential oils like tea tree oil or some other carrier oils such as jojoba oil for instance.
这些天然的油类包括精华油，如茶树油，或其他的基底油，如荷荷巴油。
3·When these oils are heated, their viscosity is reduced, and they can be burned directly in a diesel engine, or the oils can be chemically processed to produce fuels such as biodiesel.
当这些植物经过加热后粘稠度降低，便可直接在柴油机内燃烧，或者将部分油类经过化学方法加工为生物柴油。
4·Is animal fat any different than vegetable fat (like oils or avocado)?
动物性脂肪和植物性脂肪有什么区别吗(像油类和鳄犁)？
5·Most of the molecules in gum are carbohydrates, oils and alcohols. As with any other food, on their own these molecules are easily broken down.
口香糖里的主要成分是碳水化合物、油类和醇类。与其他食物一样，仅仅是这些分子的话，它们很容易分解。