I don't know how long Walcott will be out for because he has a rib injury and they are always difficult to predict.

我不知道沃尔科特会缺席多长时间，因为他有一个肋骨伤势，这种伤势一直都难以预测时间。

youdao

While many companies and LABS have been using x86 architectures for quite some time and don't anticipate variations, disruptive changes in technology are always difficult to predict.

尽管许多公司和实验室在很长时间内一直使用x86体系结构，并且不希望有任何变化，但是技术上的变化总是难以预测的。

youdao

I have absolutely not set a date for my return, because muscular lesions are always difficult to predict. Now I think we are doing the right things to make my recovery as fast as possible.

我绝对不会确定我的付出日期，因为肌肉问题一直是很难正确预测的。现在我认为我们正在为我尽快的康复作出准确的治疗。

youdao

It is always difficult to predict what the Supreme Court will do, and almost everyone agrees this is a close case. (The two federal courts to hear it so far have split, with Clinton winning at the trial level and Jones on appeal.) But there are good reasons to believe that the court may be reluctant to allow Jones' suit to go forward.

CNN: Will She Have Her Day In Court?

But it has always been notoriously difficult to predict how a judge will behave once he or she gets on to the Supreme Court.

ECONOMIST: The Supreme Court: The coming firestorm | The