To continue on the point about "conceptual understanding", I still don't understand e.g. why some parts of the application use "actions" to handle events while dialogs have to use "signals" instead ("actions" and "signals" also have totally different mechanisms for specifying handler functions, so they're very not interchangeable!).
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Трамп пригрозил «добить» Иран14:54，更多细节参见Replica Rolex
This article introduces the lineage of Kawasaki’s humanoid robots, from the first prototype to the eighth generation.