optional ports中文什么意思

例句与用法

1. If it is difficult to state definitely one or several ports, optional ports can be adopted .
   假如难以明确写出一个或几个港口，就可以采用选择港这个办法。
2. Should process . a uri prefix string is composed of a scheme http or https , a host , an optional port , and an optional path
   Uri前缀字符串由方案（ http或https ） 、主机、可选端口和可选路径组成。