airline vs. airlines：
airline：通常指单一的航空公司。
airlines：通常指多个航空公司或航空公司行业整体。
n.
a hose that carries air under pressure
同义词：air hose
a commercial enterprise that provides scheduled flights for passengers
同义词：airline businessairway
单数形式：The airline offers flights to over 100 destinations worldwide.
中文：这家航空公司提供飞往全球超过100个目的地的航班。
复数形式：Many airlines have introduced new safety measures due to the pandemic.
中文：由于疫情，许多航空公司引入了新的安全措施。
Airlines are businesses that operate aircraft to transport passengers and cargo. These companies typically have a fleet of airplanes and a network of routes that connect various destinations. Airlines can be categorized into several types based on their services, including major airlines, regional airlines, low-cost carriers, and cargo airlines. They play a crucial role in global transportation, commerce, and tourism, providing a fast and efficient means of travel across long distances.
