by request的用法和樣例：
例句
- He lined out a few songs upon request.
他應邀演唱了幾首歌曲。 - The professor came to our school to give lectures by request.
教授應邀來我校講課。 - The bills were introduced by request.
這些議案是應請求提出來的。 - The Member instituting such export prohibition or restriction shall provide, upon request, such a Member with necessary information.
應請求，設立此類出口禁止或限制的成員應向具有實質利益的成員提供必要的信息。
