If the ice thickness is not sufficient, activities on the ice are dangerous.

Mr. Hyojo is my best friend.

This road is dangerous, so please be careful.

Please avoid this road because it's dangerous.

This ice is very cold.

We participated in the local cleaning activity over the weekend.

We are actively participating in local activities.

Mr. Koori is my best friend.

Last night, hail suddenly started to fall.

He has a heart as cold as ice.