Somewhere along the line, holiday tipping went from an optional thank-you for a year of services to a Mafia-style protection racket.

一路走来，节日小费从对一年的服务表示感谢的选择变成了黑社会性质的勒索保护费。

youdao

Infrared protection can be configured (Optional).

红外线保护装置(选用)。

youdao

3 solder temperature: 0 ~ 450 degrees, optional settings, intelligent temperature control protection;

焊锡温度：0～450度，随意设置，智能温控保护；

youdao

Services offered by Visa consists primarily of optional services such as extended cardholder protection and concierge services, cardholder services and fees for licensing and certification.

FORBES: Three Businesses Make Visa Worth $86

The organization argues that a single, optional regulator would establish a uniform level of consumer protection, it would give consumers faster access to a broader range of insurance products and it could increase competition in the marketplace.

FORBES: Magazine Article

Features such as Advanced Theft Protection (ATP), a system platform that is resistant to deep-level hacking and the optional embedded Trusted Platform Module (TPM) help ensure that even if the STYLISTIC Q550 is lost or stolen, the data it carries remains protected.

ENGADGET: Fujitsu's Stylistic Q550 Windows 7 tablet: orders kick off tomorrow starting at ��699