Several properties of agar render it a superior jelly. Agar isn’t broken down by microbial enzymes apart from a few species (including bacteria living in marine and freshwater habitats), and it dissolves well in boiling water, making it easy to sterilize. The jelly doesn’t react with the ingredients of a broth, whose composition can be adjusted to meet the nutritional requirements of different microbes, and sets to a firm gel without the need for refrigeration.
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那篇手记简单记录了外公作为铁路工人的成就，但更多篇幅落在了他对棍棒教育的信奉，以及我——一个敏感叛逆、远离父母的青春期少女——如何寄人篱下，旁观暴力的代际传承。，这一点在同城约会中也有详细论述
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