短語詞組短語study y out 解決Feasibility study on Out -of-band DTMF 帶外DTMF的可行性研究study out a mystery 解開奧秘Study out of school 戶外學習study and carry out 深入學習貫徹Later study out 晚自修外出study out a puzzle 解開一個謎study out a plan 擬出一計劃clinical study was carried out 進行臨床研究 返回 study out