25.橡胶 1.kw1: TKS(蒲公英的一种)可能代替traditionalH aw+: TKS 2.kw2: 天然橡胶的优点there is often no good substitute for the real thing a: resilience and strength b: price 3.kw3: 天然橡胶的缺点natural rubber H has problems a: spread widely b: take time to grow 4.kw4: natural rubber H的替代品 aw-àTKS aw-: gua aw+: TKS 5.kw5:德 对TKS的研究发现TKS to produce rubber aw+ 6.kw6:德 运用方法改良TKS avoidcoagulating too soon aw+: plantàcoagulation aw-: SGàcoagulation 7.kw7:美 实验workingon increasing the yield of rubber from TKS-crossbreeding 8.kw8: 展望produce a new species
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