我很珍惜这个来之不易的机会。
我会尽我最大的努力去学习，珍惜这来之不易的机会。
I will try my best to study hard to treasure this hard-won chance.
在大学的三年里我们应该好好珍惜这来之不易的机会。 锻炼自己各方面的能力。作为协会的一员我会努力做好自己的本职。
We should take adventage of these precious college life, to upgrade all sorts of abilities in the three years, as a member of the association. i will try my best to do a good job.
我们知道，这一成就来之不易，这是道德领域取得的巨大成就。不得出于不公平理由，包括不得以人们无力支付为由，剥夺人们获得挽救生命的药品的机会。
As we all know, this was a difficult achievement, but a great one on the moral front: people should not be denied access to life-saving medicines for unfair reasons, including an inability to pay.
看到这次日全食的全食阶段的机会来之不易。
Other opportunities to see the total phase of this eclipse of the Sun were also hard to come by.
于是，许多人便不得不半途而废，放弃来之不易的学习机会。
Studying abroad costs much money and energy. Accordingly, lots of students have to give up their hard-earned opportunity.
于是，许多人便不得不半途而废，放弃来之不易的学习机会。
Studying abroad costs much money and energy. Accordingly, lots of students have to give up their hard-earned opportunity.
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