見たこともないような数の虻が、私にまとわりついてきたのです。

More horseflies than I'd ever seen came and flew around me.

その提案一石二鳥を狙ったものだろうけど、「虻蜂とらず」にならなければいいけどね。

That proposal may be a way to kill two birds with one stone, but we also have to be careful not to get greedy and spoil everything.

そんなに欲をかいていると、虻蜂取らずになっちゃうよ。

Don't be so greedy or you'll wind up with nothing.