可有可无 (kě yǒu kě wú) — dispensable, not essential, optional

Definition

Examples

• 这些东西对我来说可有可无，买不买都行。
  Zhè xiē dōng xī duì wǒ lái shuō kě yǒu kě wú, mǎi bu mǎi dōu xíng.
  These things are dispensable to me; I can take them or leave them.
• 在团队中，每个人都有自己的作用，没有人是可有可无的。
  Zài tuán duì zhōng, měi gè rén dōu yǒu zì jǐ de zuò yòng, méi yǒu rén shì kě yǒu kě wú de.
  In a team, everyone has their own role; no one is dispensable.
• 这个观点可有可无，不是我们讨论的重点。
  Zhè ge guān diǎn kě yǒu kě wú, bú shì wǒ men tǎo lùn de zhòng diǎn.
  This opinion is not essential; it's not the focus of our discussion.