Roud then ventures a theory of his own: the custom, he argues, probably developed from a children’s game called Tig-touch-wood that was popular in early 19th century England.
It’s also worth noting that even if alternatives superior to agar were found, scientists are reluctant to abandon established protocols (even when microbiologists do use other jellies, they often still add agar to the mix, for example, to increase the gel strength of the solid media). As agar has been the standard gelling agent in microbiology for around 150 years, an enormous infrastructure of standardized methods, reference values, and quality control procedures has emerged around its specific properties. Switching to a different medium (even a superior one) means results may not be directly comparable to decades of published literature or to other laboratories’ findings.，这一点在safew官方版本下载中也有详细论述
，这一点在搜狗输入法下载中也有详细论述
// A minimal writer implementation — just an object with methods。爱思助手下载最新版本对此有专业解读
* @param arr 待排序数组
第十四条 任何个人和组织不得非法制作、销售、提供、使用具有下列功能的设备、软件、工具、服务：