Compressional wave
[電] 壓縮波
?? 詞語組成解析
a. 有壓縮性的；與壓縮有關的
wave
[wev]
n. 波浪，波動;揮手;涌現的人（或事物）;洶涌的行動（或思想）態勢;
vi. 搖擺，起伏;
vt.& vi. （一端固定地）飄揚;揮手指引;揮動…示意;略呈波形;
vt. 揮手表示;揮舞;使…略呈波形;燙（發）;
??? 情景例句
He is liked very much because of his courtesy.
他由于彬彬有禮而頗獲好感。
One woman, in Peru, was saved from an earthquake by lying between two mattresses.
秘魯的一位婦女，躲在墊子之間從地震中死里逃生。
An advertisement which begins with the magic word FREE can rarely go wrong.
凡是用“免費”這個神奇的詞開頭的廣告很少會失敗的。