troughとは何ですか?A long, narrow, generally shallow receptacle for holding water or feed for animals.Any of various similar containers for domestic or industrial use, such as kneading or washing.A gutter under the eaves of a roof.A long, narrow depression, as between waves or ridges.A low point in a business cycle or on a statistical graph.Meteorology An elongated region of relatively low atmospheric pressure, often associated with a front.Physics A minimum point in a wave or an alternating signal.