... Go to Time到…时间 Graded Solid分级实体；实体分级 Graded Surface表面分级；分级表面 ...
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graded solid
分级固体
以上为机器翻译结果，长、整句建议使用 人工翻译 。
But some Texas students are actually getting graded on their ability to design, build, and launch solid fuel missiles.
FORBES: High School Curriculum Includes Homemade Missiles
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