紧固套由弹性材料做成，支撑杆与紧固套两端与支承它们的横杆滑动连接。

The fixing sleeve is made of an elastic material, and the two ends of the support bar and the fixing sleeve are in slip connection with the supporting transverse rods.

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紧固套由弹性材料做成，支撑杆与紧固套两端与支承它们的横杆滑动连接。

The fixing sleeve is made of an elastic material, and the two ends of the support bar and the fixing sleeve are in slip connection with the supporting transverse rods.

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