adj. inaccessible
misc. un-come-at-able
这似乎不算太多，但减轻10%的体重真是相当难达到的。
That may not seem like much, but a 10 percent weight loss is really quite hard to achieve.
每一个人都有保证其生存质量的权利，而在不断增长的人口面前它已越难越难以达到。
Every human being has a right to a certain quality of life, which is harder to achieve with growing population.
达到一个有效的解释程度却非常难。
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