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In Morse code all letters are four or fewer characters long.在Morse电码中所有字母的长度只有四个或不到四个符号.He covered his tracks, burnt letters and diaries...他掩盖形迹，烧毁了信件与日记。They used chisels to chip the letters into the stone.他们用凿子在石头上刻出字母...
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n.文学（作品），信( letter的名词复数 )，函件，字母，（缝制在运动服上的）校运动队字母标志（美式英语）...
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He passed the letters to the Department of Trade and Industry.他把信交给了贸工部。I am expecting several important letters but nothing has arrived.我正在等几封重要的信件，可是一封都没到。We delved through a sackful of letters to draw the winning name...