Despite considerable effort, engineers have so far failed to find a way to cram enough hydrogen—the lowest-density substance in the universe—onboard cars.
Despite considerable effort, engineers have so far failed to find a way to cram enough hydrogen—the lowest-density substance in the universe—onboard cars.
尽管工程师已经费尽心思，却仍旧想不出一个好办法，能够将足够的氢气（全宇宙密度最低的物质）装载到车上。