Group (4) - Spelling Practices

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(1) n. (棉被) bedding made of two layers of cloth filled with stuffing
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(2) n. (制冷剂) cooling agent; causing cooling or freezing
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(3) a. Syn. foolish(荒唐的,可笑的) completely lacking of wisdom or good sense
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(4) n. (海底,海床) bottom of a sea or ocean 
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(5) a. (地震的) caused by earthquake or earth vibration; earthshaking
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(6) n. Syn. axes; spindle(杆状物,轴,垂直通道) axes; vertical passage into a mine; long narrow stem or body of a spear or arrow
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(7) n. Syn. ball; globe(球体) ball; globe; a particular aspect of life or activity
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(8) n. Syn. criteria(标准(的)) criteria; basis for comparison
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(9) n. Syn. feat; exploit(惊人表演,绝技,特技) difficult or unusual or dangerous feat usually done to gain attention
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(10) n. (增付的费用,附加费) an additional charge; charge an extra fee