次の英文の下線部を訳しなさい It was at lunch on a cold Sunday in late January that we first heard the noise. It sounded like a tapping; slightly metallic Reluctant to leave the table, at first we speculated on the possibilities. But when the tapping became persistent, or rather insistent, we went to investigate. And so we came upon the blackbird, pecking at the window. (法政大)