Dojo has proven to be hard to keep up with, as new versions come out very often and the code changes a lot between even minor versions.

Dojo已被证明难以维护，因为新版本层出不穷，甚至在小版本之间代码变动也很大。

youdao

It's not always easy to form the close bonds of friendships, though. It may be especially hard to develop and keep up friendships when your life is hectic - work demands, family time, school.

然而，建立深厚的友谊并非易事，尤其当工作需要、家庭生活以及学校等因素使得生活忙乱时，想要建立并维系友谊变得很难。

youdao

If you are not passionate, you simply will not be able to keep up the consistency, quality, and hard work it takes to succeed.

如果你冷若冰霜，你就不能保持取得成功所需的一致、品质以及努力。

youdao

This spending pace, too, will be hard to keep up.

ECONOMIST: Just when you thought deflation was the worry

All of this has been great for a short-term pop, but it will be hard to keep this up.

FORBES: Gold Gets the Yellow Light?

In the years ahead, investors will be hard pressed to keep up with inflation in these assets, let alone achieve a positive real return or meet their financial goals.

FORBES: Never Is It The 'Perfect' Time To Invest