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since a little while ago
先程来、気になっていた。
I had been bothered by it for a while.
先程来ずっと同じ話題が続いている。
The same topic has been going on for a while now.
先程来、会議室の外で待機している社員が数名いる。
There are several employees who have been waiting outside the conference room for a while.