英语语法分析

Normally, the seller is obligated to prepay the ocean freight.

在通常情况下，卖方有责任预付海运费。

In their previous hosting service they had to prepay for a month at a time.

在之前的托管服务上，我们必须要预付一个月的费用。

It may be advantageous to delay payments in one year and prepay them in the next year to bunch the expenses in one year.

把当前年度的费用延迟到下一年支付，在下一年预付它们，这样可以把相关的费用集中到一年内。