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.
A standardized self-contained executable artifact
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这牛重得实在费劲，走在前面的人抬着木桩，后面的人就得高举木桩，才能保持牛身平衡。接二连三有人踩滑摔趴在地上，被旁边的人拉起来后，大伙继续齐喊“一二走——一二走——一二走”，山沟里的回声都是铿锵有力的。
传统的防窥膜正是从这个角度来入手的。