Agar comes from multiple sources, as many red seaweeds are “agarophytes” (that is, seaweeds containing agar in their cell walls). Species of Gelidium are the most important source of bacteriological (lab-grade) agar. Other main agarophytes, largely used for culinary agar, include red seaweeds from the genera Gracilaria, Pterocladia, Ahnfeltia, and others. Species from the genera Eucheuma, Gigartina, and Chondrus have been used as agarophytes in research during agar shortages.9
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不過，香港感染及傳染病醫學會名譽司庫徐詩駿醫生對香港本地媒體指出，向政府領有飼養牌照的寵物犬，只要身體健康，並已接種所有指定疫苗——包括狂犬病（瘋狗症）疫苗——再加上每月下藥杜蟲，在餐廳傳播疾病的風險很低。
* 时间O(n) 空间O(n)（理论最优，无冗余计算）