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1. The sheath column is made of a special material that protects the cable from damage.
护套柱是由一种特殊材料制成的，用于保护电缆免受损坏。
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2. The sheath column is used to protect the cable from external interference.
护套柱用于保护电缆免受外部干扰。
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3. The sheath column is an important component of the electrical system, providing protection and insulation forthe cable.
护套柱是电气系统的重要组成部分，为电缆提供保护和绝缘。