footholds造句怎么写

abuse starts leaks in many gate valves... lines used for footholds and handholds... unsupported lines and everyday knocks and bumps. Distortion tests show that NIBCO block valves resist the distortive forces which result from such abuse.

The mountain climber could not find many footholds on the melting ice.

A climber needs secure footholds.

Eating for Skylab's three-member teams was a fairly normal operation: footholds allowed them to situate themselves around the table and "sit" to eat.