However, facts A, B, and C are never used again; they were instrumental to the argument because they allowed one to establish D, but once D is established, A, B, and C can be safely forgotten.

然而，A,B和C再也没有被使用到；他们只是辅助性的证明，因为它们被用来建立D，然而一旦D被建立起来后，A,B,C可以被毫无顾虑地忘掉。

youdao

Since the sum b+c+d is a multiple of 5, and at least one of the terms is a multiple of 5, either only one is, or all are.

因为b+c+d所得是5的倍数，所以其中至少有一个数值是5的倍数，或者只有一个，或者三个都是。

youdao

For our hike, my two companions and I (A) had chose (B) to walk along the Appalachian Trail, one of (C) theoldest and best-loved (D) hiking paths in the United States.

题目：我和我的同伴在远足旅行中选择沿着阿巴拉锲亚山脉走，踏实美国最古老也是最受喜爱的远足路途之一。

youdao

For our hike, my two companions and I (A) had chose (B) to walk along the Appalachian Trail, one of (C) theoldest and best-loved (D) hiking paths in the United States.

题目：我和我的同伴在远足旅行中选择沿着阿巴拉锲亚山脉走，踏实美国最古老也是最受喜爱的远足路途之一。

youdao