医生们难以判定她的确切病因。
Doctors found it hard to establish the precise nature of her illness.
我难以判定，究竟是现在这个七十多岁的我比年轻时更了解世界，还是我对世事一天天地更加没有头绪。
I'm having trouble deciding whether I understand the world better now that I'm in my seventies than I did when I was younger, or whether I'm becoming more and more clueless every day.
这种名称在单个分析环境中通常是有意义的，但是，当 [...] 在同一 个目录中进行多个分析时，就难以判定它们是什么了。
Names like this are often meaningful in the context of a single analysis, but it can be quite hard to decide what they might be when [...] several analyses have been conducted in the same directory.
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