long term store造句

• Thermoplastic phenol - formaldehyde resin bond synthesized by solution po1ymeization is commonly used in making diamond grinding wheel , which has disadvantages such as : absorbing moisture , difficult mixing , can not being long term store , needing curing agent , and giving off dangerous gas
  目前，金刚石树脂砂轮普遍采用溶液聚合热塑性酚醛树脂作结合剂，此结合剂存在著易吸潮结团、混料困难、不易长期存放，需加固化剂才能固化，且固化过程中有大量的有害气体溢出，使用时需要加工成粉末等缺点。