He is as cool as a cucumber.

他是个相当冷静的人。

youdao

The choices for "warm" and "cool" foods range from simple sea cucumber to the delicacy of bird's nest soup, depending on the individual's economic circumstances.

“温性”与“凉性”食物的选择从简单的海参到美味的燕窝汤不等，视个人经济情况而定。

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Not everyone can keep as cool as a cucumber in an emergency.

并不是每一个人在紧急情况下都能够保持冷静。

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You might say a person is as cool as a cucumber if he never seems to worry about anything and stays calm in a stressful situation.

VOA: special.2011.02.13

He was cool as a cucumber in his seersucker suit.

CNN: Mardi Gras 2006

Jutting out of London's skyline in all its futuristic glory, the "Gherkin" building has managed in the last few years to embed itself in the city's psyche as an icon, an edifice that just looked as cool as a cucumber.

FORBES: Magazine Article