// 测试用例（可直接运行验证）
Agar is so critical that since WWII, scientists have tried to find alternatives in the event of a supply chain breakdown, especially as recent shortages have caused similar alarm. But while other colloid jellies have emerged, agar remains integral to laboratory protocols because no alternatives can yet compete on performance, cost, and ease of use.
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However, the platform said it was now developing "more verification options" for users that would not require facial or ID scans. One such option in development is credit card verification.
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On the fourth loop iteration, the backing store of size 4 has only 3，这一点在WPS官方版本下载中也有详细论述
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