Where is the entrance to this place?

Her smile was shining brightly.

His name is Sansan.

His single word triggered a chain reaction, and everything changed.

She overreacted to his words.

Nuclear reactions are used for mass production of energy.

I was surprised by his overreaction.

His body showed a rejection reaction to the transplanted organ.

His proposal received assent from everyone.

He is the third son in the family.