This is the 6607th most frequent Chinese word.
更何况
"What's more" or "let alone."
In this sentence, "更何况" introduces an additional reason emphasizing the difficulty of the situation.
他工作已经很忙了，更何况还要照顾家人。
He is already very busy at work, let alone having to take care of his family.
Here, "更何况" is used to bring up an additional factor that exacerbates the situation.
天气这么热，更何况没有空调，真是难受。
The weather is so hot, not to mention the lack of air conditioning, it's truly uncomfortable.
In this context, "更何况" highlights the added challenge by bringing up an example of greater difficulty.