understanding可数吗

　　There was complete understanding between Wilson and myself.

　　威尔逊和我彼此完全理解与信任。

　　We must tackle the problem with sympathy and understanding.

　　我们必须带着同情和谅解来处理这个问题。

　　The committee has little or no understanding of the problem.

　　委员会对这个问题了解不多或根本不了解。