When taking the order did the waiter exhibit a good working knowledge of the menu and its ingredients?

点单时，服务员有熟练掌握菜单及其中的成分了吗？

youdao

When taking the order did the waiter exhibit a good working knowledge of the menu and its ingredients?

点单时，服务员有熟练掌握菜单及其中的成分了吗？

youdao