550. call…in question 对…表示怀疑

549. be qualified in 在某种科目或学科上合格 be qualified for 在某种职业上合格

548. to the purpose (=useful for one’s purpose)得要领的, 中肯的

547. on purpose(=by intention, deliberately)故意

546. in public 公开地, 当众

545. provide for 为…做准备

544. be proud of 为…自豪

543. protect…from 阻止..不受,保护不受

542. in proportion to 与…成比例

541. prohibit…from (=forbid) 禁止, 阻止