Surgery may be required to remove the thrombus.

可能需要手术来移除血栓。

Surgery may be required to treat hydronephrosis.

可能需要手术来治疗肾积水。

Surgery may be required to repair a damaged mitral valve.

修复受损的二尖瓣可能需要手术。

Surgery may be required if the bursa is severely damaged.

如果囊严重受损，可能需要手术。

Surgery may be required if the tendon is severely damaged.

如果腱严重受损，可能需要手术。

Surgery may be required if the styloid process is damaged.

如果茎突受损，可能需要手术。

Surgery may be required to treat problems with the pylorus.

治疗幽门问题可能需要手术。

Surgery may be required to remove stones from the biliary tract.

可能需要手术来移除胆汁的管道中的结石。

Two or more coats may be required.

两个或更多的大衣可能需要。

Assembly will be required, however.

不管怎样，装配是免不了的。