这是一项很困难的工作，因为海伦身患疾病，不能看、听和说话。
It was a difficult job as Helen was unable to see, hear or speak because of illness.
因此，这些语言中的文本解析需要标识单词的分界，而这是一项十分困难的工作。
Therefore, text parsing in these languages requires the identification of word boundaries, which can be a very difficult task.
这是一项很困难的工作，因为挑选手机非常的主观，最适合自己的智能手机很大程度上取决于自己的需求和偏好。
This is a dangerous task because it is very subjective stuff. The smartphone that is the best fit for you is going to depend heavily on your needs and preferences.
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