As was already mentioned several times, a module should be easily replaceable. Even if there are several other modules dependent on it, having a clear, public API enables us to replace the module by a new implementation. There are also some other considerations, e.g. related to bootstrapping of the module, but the clear API is by far the most important one.
Польша выступила против сил НАТО на Украине01:48
，这一点在电影中也有详细论述
В Израиле одним словом оценили ход операции против Ирана14:58，这一点在旺商聊官方下载中也有详细论述
«Решетнев» рассказал о сборке спутника «Ямал-501»14:53，这一点在heLLoword翻译官方下载中也有详细论述