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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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The online world is full of content restrictions and blockades. It might not always seem like that, but look around. More and more restrictions on your movement are coming into force.
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香港爆發移民潮幾年後,一些人漸漸融入當地生活,也有不少人碰上不同難關。BBC中文採訪三位分別回流香港、留英爭取永居權利、一家分隔異地的移民。