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价格很贵。
错误：The price is expensive.
正确：The price is high.

速度很快。
错误：The speed is fast.
正确：The speed is high.
正确：The train travels very fast.

体重很重。
错误：His weight is very heavy.
正确：He is very heavy.

场景
Betty: Did you get the new iPhone?
Ben: Yeah. I spent like 12,000 on it!
Betty: Wow. The price is really high.
Ben: You bet. It (the phone) is really expensive.