Their adantages are the aoidance of a surgical procedure with its attendant rare complications of recurrent nere paralysis or hypopara thyroidism, and reduced cost.

• 它们得优点是：免得动手术，并防止由之引起的罕见并发症，如喉返神经麻痹或甲状腺机能减退等，而且费用低廉。