Order isn't important for a dictionary container, so this should make sense because you aren't appending a new mapping but you're adding it to the container.

对于dictionary容器，次序是不重要的，所以这应该好理解，因为不是在dictionary后面附加映射，而是将它添加到容器中。

youdao

To add the appropriate water in a container, heated to 70 degrees Celsius, then slowly stirring, adding hydroxypropyl methyl cellulose, it will float to the surface, and then forming a slurry.

先在容器中放入适当的热水，加热到70摄氏度之后，再慢慢地搅拌，加入羟丙基甲基纤维素，它就会浮到水面上，然后形成一种淤浆。

youdao