It is the weak link in the company's line of products.这是公司系列产品的薄弱环节。The company came out with an entirely new line of products last year, and their competitors never knew what hit them. 去年这家公司推出一款全新产品，令竞争对手猝不及防。The store carries a full line of products.这家商店出售各种产品。