The strong acid is the active site for creaking para-diethylbenzene and ethylbenzene and it has little effect on p-isomer selectivity of disproportionation and isomerization.
强酸位是对二乙苯和乙苯裂化的活性中心，而对歧化和异构化反应生成对位异构体的选择性影响不大。
Site: 6 cases in sternocleidomastoid muscle, 3 cases in thyroid, 1 cases in para tracheal, 2 cases near carotid sheath, 3 cases in superficial lamella, 1 case in pre-epiglottis space.
异物存留部位：胸锁乳突肌内6例，甲状腺内3例，气管旁1例，颈鞘旁2例，甲状软骨浅层3例，会厌前间隙1例。
Site: 6 cases in sternocleidomastoid muscle, 3 cases in thyroid, 1 cases in para tracheal, 2 cases near carotid sheath, 3 cases in superficial lamella, 1 case in pre-epiglottis space.
异物存留部位：胸锁乳突肌内6例，甲状腺内3例，气管旁1例，颈鞘旁2例，甲状软骨浅层3例，会厌前间隙1例。
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