道线的英文：
harness
n. 马具，挽具；保险带；安全带
v. 给（马等）上挽具；治理；控制，利用
I harness the horse to the cart.
我把马套在车上。
The vet had improvised a harness.
兽医临时凑成了一副马具。
The parachutist was buckled into his harness.
跳伞者扣上了背带。
The farmer harnessed the horse to the cart.
农夫把马套到马车上。
You can not judge of the horse by the harness.
凭马具难断马优劣。