have trouble doing简单

Primary care providers have their hands full and may not be able to follow through with patients who have trouble driving because they can’t turn their heads or remember where they are going — or have gotten shorter and haven’t changed their seat settings sufficiently to reach car pedals easily.

初级保健医生忙得不可开交，可能无法对那些驾驶有困难的病人进行跟进——这些病人或是因为无法转头、记不住要去哪里，或是因为身高变矮却没有充分调整座椅，以致难以轻松踩到踏板。

Some older drivers have trouble driving because they tend to ____

一些老年司机驾驶有困难，是因为他们往往____

They have trouble seeing a financial future and they are quite risk averse.”

他们很难看到经济上的前景，而且相当厌恶风险。”

Previous studies on CSR have had trouble differentiating these effects because consumers can be affected by all three.

以往关于企业社会责任的研究难以区分这些效应，因为消费者可能同时受到这三方面的影响。