InType 4 situations, where there are few alternatives and change is difficult, partnerships may be unavoidable.
在第四种情况下，几乎没有其他选择并且很难进行更改，伙伴关系可能是不可避免的。
2
A third type of mountain may be formed as a result of volcanic activity which occurs in regions of active fold mountain belts, such as in the Cascade Range of western North America.
第三种类型的山可能是由于火山活动形成的，一般发生在活动性褶皱带地区，如北美西部的喀斯喀特山脉。
3
It is not at all clear why the costs of serving a highly loyal customer should in principle be different from those of serving any other type of repeat customer.