it is one o‘clock sharp 的sharp表哪个单词?为什么?

it is one o‘clock sharp 的sharp表哪个单词?为什么? it is one o‘clock sharp 的sharp表哪个单词 It's 9 o'clock sharp . o'clock sharp 翻译It is exactly ten o’clock / It’s ten o’clock sharp. It is eleven o'clock 能不能说成 It is eleven sharp. Our headmaster_______the speech at ten o'clock sharp. Thr bus will leave at 7o'clock sharp It has sharp teeth If a knife is sharp, it is easy to cut something with. 后面为什么 Is the knife is sharp No,it is blunt.这句话是对的吗? sharp的反义词是什么?