聽英文母語者的標準 發音 ，高效地練習英文聽力，在沒有出現英文字幕的時候猜出聽到的英文句子，待字幕顯示時核對，反複訓練，直至聽懂，長此以往， ... ... <看更多>

It comes from the aeronautical use of envelope referring to performance limits that cannot be exceeded safely. The phrase was originally limited to space flight ... ... <看更多>

飞机英语plane发音. plane 英[pleɪn] 美[plen] n. 飞机;平面;程度,水平adj. ... Learn about the forces that help (and hinder) airplane flight. ... <看更多>