has become a stringent
已经成为严格的
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Sludge has become a stringent problem in wastewater treatment field.
污泥问题已成为污水处理所面临的一个非常严峻的问题。
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Post Sarbanes-Oxley, a 2002 law imposing stringent new corporate requirements, board membership has become a tightly regulated, formal affair.
FORBES: How to Become a Corporate Board Member
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