by (或 on) request

in response to an expressed wish

應(yīng)（某人）請求

by request

In response to an expressed desire

應(yīng)…的要求

We are offering these scarves for sale again by request.

應(yīng)大眾要求我們再次出售這些頭巾

in request

In great demand

受歡迎

a pianist in great request.

極受歡迎的鋼琴家

on request 或 upon request

When asked for

一經(jīng)要求

References are available on request.

有參考資料備索