genetics
遗传学
例句：
William Bateson coined the word genetics and several other useful terms.
William Bateson 创立了“遗传学”这个名词和其他一些有用的术语。
to no purpose
无结果；无效
例句：
He tried to find out the cause, but all to no purpose.
他试图找出原因，但是全无结果。
It's a once in a lifetime chance.
这是一生难得的机会。
对话：
A: Jack, shall I take the job in the US?
B: If I were you I would take it.
A: Would you?
B: Sure. It's a once in a lifetime chance.
A：杰克，我该不该接受美国的那份工作呢？
B：我要是你就接受它。
A：你会吗？
B：当然会。这是一生难得的机会。
