trenchとは何ですか?A deep furrow or ditch.A long narrow ditch embanked with its own soil and used for concealment and protection in warfare.A long, steep-sided valley on the ocean floor.To cut a trench in.To fortify with trenches.To place in a trench.To make a cut in; carve.To dig trenches or a trench.To verge or encroach. Often used with on or upon.