前进 1.(向前行动或发展) advance; go forward; forge ahead; make progress; march 大踏步前进 make big strides forward; 继续前进 continue to make progress; 摸索前进 feel one's way; 破浪前进 breast the waves; 全速前进 go forward at full speed; 前进中的问题 problems accompanying our advance and development; 工作稳步前进。 the work is progressing steadily. 他们在大雪中无法前进。 they made no progress in the heavy snow.2.[穴位] qianjin
Stationary waves are distinct from the progressive ones wherein the waves move across the body of water ? as if we had dropped a pebble in the dish of water 驻波与前进波不同,在后一种情况下,水波向四周传去?就好象我们曾向盘中投下一块卵石时的情景一样。