"an ornamental gold braid on the shoulder of his uniform"
"the car pulled off onto the shoulder"
"He shouldered his way into the crowd"
"shoulder the burden"
误 They fought shoulder by shoulder and defeated the aggressors.
正 They fought shoulder to shoulder and defeated the aggressors.
正 They fought side by side and defeated the aggressors.
析 表示“并肩,齐心协力”,应该说shoulder to shoulder,或者side by side,但不能说成 shoulder by shoulder。