在句子Luckily, I didn't tell anyone和Financially, we have a serious problem中，luckily和financially是句副词。
In 'Luckily, I didn't tell anyone' and 'Financially, we have a serious problem', 'luckily' and 'financially' are sentence adverbs.
“However,” 在这里只是一个引导性的副词，这个句子就是有意义了。
Once it's clear that "however" is just an introductory adverb, the sentence makes sense.
通常不需要“修饰语”（句子中的副词和形容词）。
The "modifier" (adverb or adjective in a sentence) is not required, usually.
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