manually shifted transmission

例句：

1. 1. The car has a manually shifted transmission that allows for easy shifting of gears.
   这辆车有一个手动变速器，可以轻松地换挡。
2. 2. The old truck had a manual transmission, which was not as smooth as the modern automatic models.
   那辆旧卡车有一个手动变速器，不如现代的自动模型那么平滑。
3. 3. The new sports car features a fully automatic transmission, which is much more efficient than the previous manual setup.
   这款新运动车配备了完全自动变速器，比之前的手动设置更高效。