All of the disputed territories contain valuable minerals, and some of them yield important vegetable products such as rubber which in colder climates it is necessary to synthesize by comparatively expensive methods.

• 这些争夺地区都有宝贵的矿藏，其中有些地方还生产重要的植物产品，例如橡胶，这在寒冷地带必须用成本较大的方法来人工合成。