New Words：

disease [dɪˈziːz] n. 病;疾病
diseased [dɪˈzizd] adj. 有病的；患病的

Sample Sentences：

It is not known what causes the disease.
More than 400 people a year die of this disease.

The plant is diseased and will soon die.
We must cut away the diseased branches from the trees.

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