someone who is the first to explore a place.
第一个对一个地方进行探险的人。
He goes after (ie tries to attract sexually) every woman he meets.
他对女人见一个追一个.
This one will do, will not it ?
这一个可以，对吗？
A pear, a pear, a pear.
一个梨，一个梨，一个梨。
One couple, one child (as advocated by china' family planning policy); one child per couple; one child for every couple
一对夫妇只生一个孩子
Either of a pair of conjugate quantities.
一对结合体中的一个
On the one hand we shall open to the outside world, and on the other we shall invigorate our domestic economy.
一个对外经济开放，一个对内经济搞活。
One twin and one single. Is that right?
一个双人房和一个单人房，对不对？
Our open policy has two aspects: domestic and international.
开放是两个内容，一个对内开放，一个对外开放。
A mapping of one space onto another or onto itself.
变换一个空间与另一个空间或自身的一一对应
He rode roughshod over one opponent after another.
他把他的对手一个接一个地击败了。
The sympathetic vibration of a circuit to a signal.
一个电路对某一个信号共鸣的振荡。
Desmond问 Locke:“ What did one snowman say to the other snowman?
(一个雪人对另外一个雪人说什么?
The whole Party should be united in its understanding of this question.
全党对这个问题要有一个统一的认识。
of words so related that one contrasts with the other.
相关词语中一个与另一个形成对比。
To establish a mapping of(an element or a set).
对应建立一个（一个元素或集合的）映射
One country declared war on another.
一个国家对另一个国家宣战。
have absolute trust in a person
对一个人绝对的信任