6) • The past perfect 过去完成式(had pp) • 在过去的一个特定时间之前就已经 ________ • {By the time, when, before} S + V-ed (后), S + had {already, not yet} pp ...
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In the election two years ago, the socialists had a three-point lead over the conservative PP.
在两年前的选举中，社会党人领先了保守派的人民党3个百分点。
The result showed that the cooling water temperature had a crucial role on the crystallization, morphology and tensile strength of PP films.
结果表明：冷却水温度变化对生产pp薄膜的结晶、形态和拉伸性能有很大影响。
High melt strength pp (HMSPP) had excellent physical and mechanical properties and its foamed products had wide applications.
高熔体强度聚丙烯具有优异的物理机械性能，其发泡制品拥有广泛的用途。
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