Suddenly, they heard a voice behind them.
突然他們聽到身后有聲音。
新概念英語第一冊
Lesson 119 A true story
?? 句中詞匯解析
從本句中提取的重要詞匯
adv. 意外地，忽然地;奄;勃;霍然;
?? sudden突然的 + ly ...地 → adv.突然地
"Suddenly he found himself awake and fully alert."
突然他發覺自己醒了過來，而且高度警覺。
近義：impromptu, inadvertently, abruptly, offhand, overnight, sharply
反義：progressively, slowly, sparingly, stingily, inchmeal, consecutively
prep. （表示位置）在…的后面;支持;（表示順序）在身后;（表示比較）落后于;
adv. 在后面;向后;在后面較遠處;（落）在后面;
n. 〈口〉屁股;
?? be構成一些介詞+hind藏在后面→在…后面
"The crowd had to stand behind barriers."
人群只好站在障礙物后面。
近義：back, posterior, rear, rearward, lagging, late
反義：quick, rapid, accelerated
n. 嗓音;（動詞的）語態;呼聲，發言權;歌唱才能;
vt. 發音;表達，說出;給（一部樂曲）配上聲部;給（如管風琴音管）整聲;
"an amiable tone of voice"
親切的聲調
近義：articulate, mouth, phrase, pronounce, release, reveal
v. 聽到，聽見( hear的過去式和過去分詞 );聽說;得知;聽取;
"We now enjoy these comforts of which formerly we had only heard."
我們現在享受到了過去只是聽說過的那些舒適條件.