My boyfriend gave me a gift.

He was staring at the horizon on the sea.

He was staring at the horizon.

He was walking along the coastline.

He cut the fuse to prevent the explosion.

In meteorology, an isotherm refers to a line on a map that indicates the same temperature.

This bridge is reinforced with steel wire.

The doctor took an X-ray of my leg.

In geography, a tropic indicates a specific latitude on the earth.

In this map, the longitude lines are clearly displayed.