What is an example of metaphor in the novel, The Valley of Amazement?

Metaphor:

“To kill another person is also violence done to yourself, and you bear the damage to the end of your days.”

“It was like staring at an old tortoise that never moved. I would have had sympathy for her if she weakened more each day until her face turned gray and she died. But she was the same every time I saw her. It made me so mad.”

“The house had been abuzz over the coming overthrow of the Ching dynasty… servants had also caught the fever of change. They recited a litany of tragedies under imperial rule…Opium had turned their men into the living dead.”