He made a quick switch from an unfriendly to a friendly manner when he saw that they could help him.

当他意识到他们可以帮助他时，他的态度一下子从不友好变得友好了。

youdao

He made a quick switch from an unfriendly to a friendly manner when he saw that they could help him.

当他意识到他们可以帮助他时，他的态度一下子从不友好变得友好了。

youdao