What we need to do is make batteries safer, more efficient, and more environmentally friendly.
海洋是伟大的高速公路,伟大的平原,人类交往的伟大领域。
镜子经过淬炼会越来越明亮,钢铁经过锤炼会越来越坚硬。
In mathematics, the journey is as important as the destination.