He is sure to know that
准───accurate;知道───know
The rifle was extremely accurate.───这把步枪准头极高。
The figure is accurate to two decimal places.───这个数精确到小数点后两位。
His pronunciation is not accurate.───他发音不准.
They were accurate in their prediction that he would change her life drastically.───他们预测得没错,他使她的生活发生了翻天覆地的变化。
Hearsay definitely can't be regarded as accurate information.───道听途说的决然不能算作很准确的消息.
She gave an accurate account of the accident.───她对事故做了准确的描述.
Evidences are clear and accurate.───例证明确.
I have been convinced that the print media are more accurate and more reliable than television.───我已经确信印刷媒体比电视更准确、更可靠。