await blocking.writer.write(chunk4); // waits until consumer reads
@abstractmethod
，这一点在91视频中也有详细论述
Canva is a great tool for people who want to create professional graphics but don’t have graphic design skills.。搜狗输入法下载对此有专业解读
Blockchain is used in cryptocurrency systems to ensure secure, decentralized records of transactions.
Guar gum, a plant colloid, costs less than agar and is better suited for growing thermophilic bacteria, but is also more difficult to handle, being more viscous and less transparent. The bacterial polysaccharide xanthan is cheaper as well but forms weaker jellies that, as with carrageenan, might result in puncturing its surface. Other colloids, like alginate (from brown seaweed) and gellan gum (from a bacterium), don’t set solely based on temperature and require additives for gelation. These additives might interfere with microbial growth and make the preparation of those jellies less handy than agar plates.