Silhouetted against the sun stood the figure of a man.阳光映衬出一名男子的轮廓。We could see a church silhouetted against the skyline.我们可以看到一座教堂凸现在天际.The mountain was silhouetted against the sky.这座山在天际映出黑色影象....
铅是早在古代就已知的金属之一。Lead was one of the metals known to the ancient world.水银是一种已知的有毒物质。Mercury is a known poison.人们通常从已知的事实中推断未知的事实.People usually infer an unknown fact from a known fact....
他们不必交税。They didn't have to pay tax.你若要求部落里的人们交税,他们会反叛的.The tribesmen will revolt if you ask them to pay taxes.这些收入不须交税.No tax is payable on these earnings....