系上裤带用英语怎么说

系上裤带用英语可以称为 "suspenders" 或者 "braces"。
"Suspenders" 来源于拉丁语 "suspendere"，意思是 "悬挂"。"Braces" 来源于法语 "brasser"，意思是 "托住"。
英文例句和中文翻译如下：
I always wear suspenders with my dress pants to keep them from falling down. (我穿裤子总是系上裤带，这样可以防止裤子掉下来。)
My grandfather always wore braces with his formal suit. (我爷爷穿正装总是系上裤带。)
I prefer suspenders to belts because they are more comfortable and don't leave a mark on my waist. (我更喜欢裤带，因为它们更舒服，不会在腰部留下印痕。)
Some people think that braces are more stylish and sophisticated than belts. (有些人认为裤带比腰带时尚和优雅。)