You use thumbs up to indicate approval.

在西方，竖起拇指可以表示「对」，或是「好」

youdao

Use of a WHO programme or project logo does not indicate approval or endorsement by WHO.

使用世界卫生组织规划和项目标识并非表明世界卫生组织的批准或认可。

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A Payment Certificate shall not be deemed to indicate the Engineer's acceptance, approval, consent or satisfaction.

支付证书不应被视为是工程师的接受、批准、同意或满意的意思表示。

youdao

Other non-premium updates include a new Stamps tool that'll let you mark a document with symbols to indicate approval, disapproval, a question mark, an exclamation point and (of course) a heart.

ENGADGET

Opinion polls indicate that the government's approval ratings have fallen by at least half since September, when it was seen to have mishandled an incident involving a Chinese trawlerman who had been arrested in waters that Japan claims as its own.

ECONOMIST: Japan's hobbled government

Unlike some previous rumors that claimed Apple may be stalling on the approval an already submitted app, they indicate Google did not know of Cupertino's plans to launch its own solution this year until it was publicly announced in June, since their contract extended into 2013.

ENGADGET: Rumors about Google Maps app for iOS intensify, claim it's still months away from launch