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Generally a brief note or a phone call will suffice.

通常写个便条或打个电话就足够了。

《牛津词典》

A thank-you note or telephone call after the visit is also considered polite and is an appropriate way to express your appreciation for the invitation.

拜访后的一封感谢信或一个电话也被视作一种礼貌，是一种表达你对收到邀请的感谢的适当方式。

youdao

For example, when a user pulls out the S Pen during a phone call, the S Note application automatically pops up on the screen, allowing users to jot down a quick note.

ENGADGET: Samsung Galaxy Note II unveiled: 5.5-inch HD Super AMOLED display, Android Jelly Bean and more S Pen functionality

No note or telephone call, nada.

NEWYORKER: The Pura Principle

To be sure, rival IBM sounded an upbeat note during its earnings call last month.

FORBES: Magazine Article