The flotation logs are completely enclosed in a vinyl coated fabric which is heat sealed to provide a watertight flotation compartment and greater strength.
浮力原木完全密封在乙烯胶布中，采用热封，提供防水浮力小室和更高的强度。
The flotation logs are completely enclosed in a vinyl coated fabric which is heat sealed to provide a watertight flotation compartment and greater strength.
浮力原木完全密封在乙烯胶布中，采用热封，提供防水浮力小室和更高的强度。
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