hard to find

基本解释

You would think that there must be limitations to the value of spacing. If there are, they are hard to find.
你或许认为间隔时间学习法肯定有它的局限性。如果有局限性，这种局限性现在很难发现。
The solutions are not hard to find: a wholesale switch to paper ballots and optical scanners; more training for election officials; and open access to machine software.
解决办法不是很难找到：大批量更新纸制选票和光学扫描仪；对选举官员进行更多的培训；开放机器软件的准入。
Not only is aspirin so cheap it will not make any money for drug firms, it could be hard to find a group of women with breast cancer who were prepared never to take aspirin during a trial.
这不仅是因为阿司匹林的价格低廉，药物公司很难从它身上赚到钱，而且可能很难找到一群患有乳腺癌又愿意在试验期间准备从不服用阿司匹林的妇女。

Experts say it will be hard to find a nominee with as much experience in both health issues and politics.
This is necessary, it's hard to find holes in a Nobel Prize worthy idea.
这是很必要的，在一个获得诺贝尔的想法中,很难发现漏洞。
麻省理工公开课 - 化学原理课程节选
They're efficient enough that you have to work hard to find opportunities, but not perfectly.
如果你付出足够的努力,还是能发现机会,所以市场并不完全有效
耶鲁公开课 - 金融市场课程节选

I'm going to be losing poll workers and they're very hard to find, to begin with.
NPR: Local Election Officials Oppose Paper Ballots