如果设计工具载入器不要求非同步载入的支援，则设计工具载入器不需要实作这个介面。
A designer loader does not have to implement this interface if it does not require support for asynchronous loading.
如果设计工具载入器不要求非同步载入的支援，则设计工具载入器不需要实作这个介面。
A designer loader does not have to implement this interface if it does not require support for asynchronous loading.
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