形容词"serious"的比较级变化如下:
1. 比较级:more serious(更严重)
例句:The injury he sustained is more serious than we initially thought.(他受伤的情况比我们最初想象的更严重。)
2. 最高级:most serious(最严重)
例句:This is the most serious problem we have encountered so far.(这是我们迄今遇到的最严重的问题。)

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