介绍了一种新型结构的光杆密封盒。
A polished rod seal assembly with new structure is introduced.
一般情况下，摄影师会用密封盒罩住传统的摄影机和数码相机。
Most often, photographers use a traditional film or digital camera covered in a watertight casing.
没有人告诉我们，是轴承密封盒是专门设计的径向负荷和轴向负荷不优化。
What we are not told, is that sealed cartridge bearings are specifically designed for radial loading and not optimized for axial loading.
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