This new software maintains upward compatibility with the old version.

He is a bit thickheaded, so he didn't notice her feelings.

He is suffering from aphasia as a sequelae of stroke.

We should recycle to prevent environmental pollution.

Have you ever had an indirect kiss with him?

A gap is created in the wall of the building due to the earthquake.

He made time to meet his friends by squeezing it into gaps in his busy schedule.

A gap gradually developed between him and me.

The White House is the official residence of the President of the United States.

He went to the archives to find important information.