改错翻译句型：增词法

　　2．强调时间上的对比时，往往需要加一些词

　　Man, was, is and always will be trying to improve his living conditions.

　　人类过去、现在而且将来总是在尽力改善生活条件。

　　I was, and remain, grateful for the part he played in my release.

　　我的获释是他成全的，对此我过去很感激，现在仍然很感激。

　　The high-altitude plane was and still is a remarkable bird.

　　该高空飞机过去是现在仍然是一种了不起的飞机。