the low density ablative materials studied here have basically reached the space grade level as a result.
研制的低密度烧蚀材料基本达到了空间级材料水平。
indexes for readability usually rank usability by the age or grade level required for someone to be able to readily understand a reading passage.
可读性的指标通常可以划分可用性层级,通过一些人轻易理解一篇阅读文章所需的年龄和级别来定。
in addition, company will pay depending on grade level and zone of the country as specified in the table below.
另外,企业将根据下表规定的职级和国家区域来支付每日津贴。
「more than four-fifths of our pupils are reading below grade level when they arrive aged ten,」 he says. 「three years later, fewer than a quarter of them still are.」