The actual control condition at the root of the notch is more problematic. 在缺口根部的实际控制条件是更难捉摸的。
The notch tug is a conventional tug which is assigned to tow and push a specific barge, usually built to the shape and specifications of that tugboat. 缺口拔河是一项传统的拔河,是分配给拖车,并推动具体的驳船,通常兴建的形状和规格,即拖船。