I sat at my desk, studying the envelope.

我坐在办公桌前，研究着信封。

EIGHT o'clock Doctor Copeland sat at his desk, studying a sheaf of papers by the bleak morning light from the window.

八点钟，科普兰医生坐在他的办公桌前，借着窗外透进来的凄凉晨光研究一叠文件。