A sensible abbreviation for the class library domain might be cl.

类库域的合理缩写可以是cl。

youdao

Smaller than the larger and swanker CL- and SL-Class models and larger and costlier than the two-seat SLK-Class, the since-discontinued midsize Mercdes-Benz CLK-Class can be found in both sporty luxury coupe and convertible versions.

FORBES: Mercedes-Benz CLK-Class

Meanwhile, Mercedes-Benz is responsible for 11 out of the 20 most expensive models to insure for 2013, including multiple variations of its top CL-, S- and SL-Class models.

FORBES: The Cheapest (And Most Expensive) 2013 Cars To Insure