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.
the preposition mid
。关于这个话题，爱思助手下载最新版本提供了深入分析
2026年2月19日，川东小镇一隅。每年春节，我们都会回到这里看望外公外婆。（南方周末记者陈怡帆｜摄）
// Flush: yield any remaining data