They simply think science is too difficult for lower-grade students younger than ten years old.

他们想当然地认为科学对不足10岁的儿童太难了。

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Most of the bottles Closed Loop is currently recycling would otherwise have been shipped to China to be transformed into lower-grade plastic for cheap hard hats, artificial fleeces and the like.

若不是被闭环公司所回收，大多数的瓶子很可能会被运往中国，从而被转化成低级的塑料，用于制作廉价的安全帽、仿羊毛夹克或类似的产品。

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The biggest benefit of being a captain is that it teaches me to be responsible and set an example for lower grade students.

作为一个队长最大的好处是它教会我要负责任，并为低年级学生树立榜样。

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Some growth has been companies processing lower-grade ore that may not have been feasible at lower gold prices, analysts said.

FORBES: Global Output From Gold Mines In Upswing Although Some Constraints Persist

Meanwhile, as gold prices rose in recent years, companies often turned to lower-grade projects that have higher per-ounce operating costs.

FORBES: USAGX's Denbow: Gold-Mining Companies Face Challenges Finding New Supply

Household cooking gas will go up by just over 50%, diesel and kerosene by 33% and lower-grade gasoline by 15%.

BBC: Jordan protesters take to streets over fuel price rises