我是在城市出生长大的一代。从我记事起，过年就难寻烟花爆竹声。老一辈常说年味变淡，对我而言，厚重的年味从来只在想象中存在。围炉是我为数不多的年味来源，如今这份年味也在变淡。
Agar’s low viscosity also makes it easy to pour into Petri dishes, and its transparency permits observation of microbes growing on its surface.7 Also aiding in this is its low syneresis (extrusion of water from the gel), guaranteeing less surface “sweating”: Once a plate is inoculated, bacterial colonies stay in place and do not mix.
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