Definition: to become open and flat, or to make something become open and flat Level: C1
他小心地展开信来读内容。
He carefully ___unfolded the letter to read its contents.
当风起时，他们展开了船帆。
They ___unfolded the sails as the wind picked up.
花朵在晨光中开始展开花瓣。
The flower began to ___unfold its petals in the morning sun.
