If the value matches the current map contents for the key, the key is removed. Listing 5 shows the equivalent source for this operation.
如果值匹配键的当前映射内容，那么就删除这个键。
If the matched types are complex types, a container map is used to match them at the top level, and then match mapping will continue within the container mapping until no more matches are found.
如果匹配的类型比较复杂，那么将使用一个容器映射来在最高级别进行匹配，然后将在容器映射内部继续匹配映射，直到找到全部匹配。
It is important to know that the first operation to a map that matches a map template — but has not yet been created — will result in the creation of the new dynamic map.
非常重要的是要知道与映射模板相匹配的映射的第一次操作—但尚未建立—将导致创建新的动态映射。
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