- extensive verification
- 广泛: extensive; wide-ranging; wid ...
- 的: 4次方是 The fourth power of 2 i ...
- 核实: verify; check
- 广泛的: broad; catholic narrow; comprehensive; cyclopaedic; cyclopedic; extensive; far-flung; far-ranging; far-reaching; inclusive; large; spacious; wide-ranging; widespread
- 成本的核实: cost ascertainment
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