显然，将日期格式设置为字符串代价高昂。

Clearly, formatting dates as strings is costly.

youdao

请注意，我们必须将输出方法设置为text，这样它才有正确的格式文本(而且字符实体不被转义)。

Notice that we had to set the output method to text so that it is properly formatted (and the character entities are not escaped).

youdao

它然后将消息主体设置为一个字符串，该字符串的用户和消息数据被编码为post格式。

It then sets the body of the message to a string that has the user and message data encoded in POST format.

youdao