He dived in after her without a second thought.

他不假思索地随她跳入水中。

《牛津词典》

Without a second thought, I called a taxi for him.

我不假思索地为他叫了一辆出租车。

youdao

Then they fire them without a second thought.

然后，他们会不加考虑，就把他解雇。

youdao

When something came along that they deemed superior, they switched off their radios without a second thought.

WSJ: WSJ Sightings: Terry Teachout on the New-Media Crisis of 1949

When the Spaniard had asked for the number, the Frenchman had given it to him without a second thought.

NEWYORKER: ?lvaro Rousselot��s Journey

Those ancient New Yorkers and the Dutch and English who followed plundered the area's oyster supply without a second thought.

ECONOMIST: A dozen ocean-cleaners and a pint of Guinness, please