The stain on the windowsill conveys the same idea. So does the card on the body, which might have been prepared in the house. That all fits into your hypothesis, Watson. But now we come on the nasty, angular, uncompromising bits which won't slip into their places. Why a cut-off shotgun of all weapons--and an American one at that?
窗臺上的血跡也是出於同一目的。屍體上的卡片也是如此，卡片可能就是在屋裏寫好的。所有這一切都符合你的假設，華生。可是現在，我們跟著就要碰到這樣一些難於處理、頗為棘手、處處對不上碴兒的問題了。為什麽他們從所有武其中單單選了一支截短了的火槍，而且又是美國火槍呢？