In case of a positive screening test, confirmation of results must be carried out via more complex chemical analysis.
如果筛选检测呈阳性，就必须通过更加复杂的化学分析来确认结果。
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The project succeeded in screening 346 sites with potential chemical contamination risks and identifying 58 priority pollution sources for follow-up mitigation actions.
And therefore, as with all biology, you get selection through screening, whether you're screening for hydrogen production, or chemical production, or just viability.