病势加剧。

The patient's condition is getting worse.

一位大学发言人称：“霍金教授病势很重。”

A university spokesman said: "Professor Hawking is very ill."

是从阿维尼翁寄来的吧？但愿信里别说你妹妹病势加重了。

Was it from Avignon? I hope it is not to say that your sister is worse.

印尼滥砍滥伐，乃其与世界所患之病，病势渐沉。这场阴霾，便是该病急性发作与慢性持续的症状。

The haze is an acute and chronic symptom of a disease even more serious for Indonesia and the world: Indonesia’s deforestation.