1. An enterprise has to incur certain costs and expenses in order to stay in business.
    为了维持营业，一家企业必须担负起一定的费用和开支。

2. An enterprise has to incur certain costs and expenses in order to stay in business.
    一个企业为了继续经营，不得不支出一定的费用和开销。

3. A disunited nation therefore has to incur unduly high costs of government.
    因此，一个处于分裂的国家必须要支付过高的行政管理费用。