pull-down menu
noun [ C ] uk/ˈpʊl.daʊn ˌmen.juː/ us/ˈpʊl.daʊn ˌmen.juː/
（电脑屏幕上）下拉式菜单，下拉选项屏
a list of instructions, especially on a computer screen, that is hidden until you open it
Click "Tools", then select "Options" from the pull-down menu. 点击“工具”，然后从下拉式菜单里选择“选项”。