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.

为什么服务一个高度忠诚的顾客的成本原则上与服务其他类型的回头客的成本是不同的，这一点完全不清楚。

youdao

The horse hadn't cost him anything; so whatever he got was all clear profit.

那匹马并没有花他什么钱，所以他赚到的都是净利润。

youdao

There will probably be months of legal tussling, and it is not at all clear which side will prevail in court, nor in the battle for public opinion and legislative favor.

这场法律角逐可能会耗上好几个月的时间，哪一方在法庭占上风，哪一方又会赢得公众舆论和立法者的青睐都尚不可知。

youdao

First of all, it's clear from the Pythagoras' theorem that a is the square root of ^2 + ^2.

首先,根据毕达哥拉斯定理,勾股定理在西方被称为"毕达哥拉斯定理"

耶鲁公开课 - 基础物理课程节选