许多猪没有症状，但另一些则出现急性发热病症，呼吸困难和神经症状，如颤抖，抽搐和肌肉痉挛等。
Many pigs had no symptoms, but others developed acute feverish illness, laboured breathing, and neurological symptoms such as trembling, twitching and muscle spasms.
男人开始颤抖和抽搐，但由于他们失去了控制自己的肌肉。
The men started to tremble and twitch as though they had lost control of their muscles.
简把肌肉绷紧，不让它们颤抖。
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