...car manufacturers' long-held maxim that safety doesn't sell.是什么意思？

...car manufacturers' long-held maxim that safety doesn't sell.

汽车生产商长期奉行的座右铭——安全性并不意味着畅销

car

n. 汽车，车厢，轿车；

例句
His car was held up and he was abducted by four gunmen...
他的车遭遇拦劫，随后他被4名持枪歹徒劫持。

maxim

n. 格言，座右铭，准则；

例句
I believe in the maxim 'if it ain't broke, don't fix it'.
我相信这样一条箴言：“不破不修”。

that

det. 那个，那；pron. 那个，那；conj. 多么，如此…以至，用于某些动词、形容词和名词后，引出各种从句；adv. 不那么，那样；

例句
...expensive make-up that we saw being advertised by a beautiful model...
我们所见的由一位漂亮模特代言的昂贵化妆品

safety

n. 安全，安全性，安全处所，中卫；adj. 保障安全的；

例句
Strict safety tests are carried out on food additives.
对食品添加剂进行了严格的安全检测。

sell

vt.& vi. 卖，售，使好卖，使接受，使赞成，销售；vt. 经销，推销，出卖，欺骗；n. 销售，欺骗，失望，推销术；vi. 卖，出售，受欢迎，有销路；

例句
If the firm cannot sell its products, it will go bankrupt...
如果公司的产品卖不出去，它就会倒闭。