Tissue that is removed during the operation is checked for signs of malignancy.

手术过程中切除的组织用于诊断疾病是否为恶性。

《柯林斯英汉双解大词典》

He checked into a top London clinic yesterday for an operation on his knee.

他昨天住进了伦敦一家最高级的诊所，准备做膝部手术。

《牛津词典》

If no security permission is specified, no permissions are checked and all callers are permitted to call the interface or operation.

如果没有指定安全许可，则没有许可检查，所有调用方都允许调用接口和操作。

youdao

More than 20 houses were evacuated in the street as army bomb experts made the device safe and checked the area for other devices during a three-hour operation.

BBC: Loyalists blamed for pipe bomb attacks

Vale also highlights its support for an extensive monitoring operation in the forest run by the Brazilian Government's conservation agency ICMBio - so we checked with the agency to get their perspective.

BBC: Forests and caves of iron: An Amazon dilemma