You can't clap with one hand.
孤掌难鸣。
Let's give the children a clap.
让我们为孩子们鼓掌。
Let's clap for them.
让我们为他们鼓掌。
"If you're happy and you know it, clap your hands. "
Videos captured on the occasion showed Cook interacting with some of customers while waving to others as employees cheered and clapped in excitement.