Not worth being surprised; not at all surprising.
足值得。不值得奇怪。指某种事物或现象很平常，没有什么奇怪的。
宋·毕仲游《祭范德孺文》人乐其大而忘其私，不然则公不足为奇。”
Given his experience, his success is not surprising.
Learn the next connected idiom: 不足为奇 (bù zú wéi qí) → 奇形怪状 (qí xíng guài zhuàng)
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