How could they be so sure that the sound of it would not bring someone on to them? It's a mere chance as it is that Mrs. Allen did not start out to inquire for the slamming door. Why did your guilty couple do all this, Watson?
他們怎麽能肯定火槍的射擊聲不會把別人驚動，向他們奔來呢？象艾倫太太那樣把槍聲只當關門聲而不出來查看，這不過是偶然現象罷了。華生，為什麽你所謂的一對罪犯會這樣蠢呢？