Please deliver the goods at your <em>earliest</em> convenience.
请尽早送货。
We trust to receive a cheque at your <em>earliest</em> convenience.
我们希望早日收到你的支票。
The painting provides us with one of the <em>earliest</em> examples of the use of perspective.
那幅画给我们提供了采用透视画法的最早的范例。
