This air line operates five mainlines and twenty branch lines.
这家航空公司经营五条主干线和二十条支线。
2
This airline operates five mainlines and dozens of branch lines.
这家航空公司经营五条主干线和十几条支线。
3
The kind of thing H&M has made a virtue of by “collaborating” with designers on limited-edition lines that look very much like the designer's mainlines but cost a fraction of the price.