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99作文网 2023-08-30 02:25 编辑：admin 300阅读

3. the act of undergoing testing

同义词:trial

4. trying something to find out about it

同义词:trial, trial run, tryout

5. a set of questions or exercises evaluating skill or knowledge

同义词:examination, exam

6. a hard outer covering as of some amoebas and sea urchins