Oil rigs have to be repaired frequently and divers,who often have to work in darkness a hundred feet under water,
鉆井平臺需要經常修理，潛水員常常要在水面100英尺以下摸黑工作，
新概念英語第二冊 Lesson 90 What's for supper

?? 句中詞匯解析

從本句中提取的重要詞匯

frequently ['frikw?ntli] 詞頻1 詞根: frequen
adv. 頻繁地，屢次地;往往;動;動輒;
?? frequent經常的+ly...地 → 經常地，頻繁地
"The group have frequently used bully-boy tactics."
那個團伙常常耍流氓。
近義：oft, often, oftentimes, periodically, regularly, repeatedly 反義：occasionally, rarely, seldom, sporadically
darkness ['dɑrkn?s] 詞頻1 詞根: /d?/
n. 黑暗;陰郁;模糊;無知;
?? dark黑暗的+ness表名詞 →黑暗
"They left under the cloak of darkness."
他們在黑暗的掩護下離開了。
近義：murk, murkiness, obscurity, tenebrosity, blackness, dark 反義：lightness, limpidity, lucidity, pellucidity, splendor, transparence
divers [['daiv?(:)z]] 詞頻5
a. 各種不同的\\npron. 若干個, 好幾個
近義：manifold, many, several, some, sundry, various
often ['?f(t?)n] 詞頻1
adv. 常常;經常;時常;再三;
?? 十(ten)有八九的(of)， 經常的
"Sleep has often been thought of as being in some way analogous to death."
人們常常認為睡眠在某種意義上來說類似死亡。
近義：manyfold, oft, oftentimes, repeatedly, usually, offtimes 反義：infrequently, occasionally, seldom, sometimes
work [w?k] 詞頻1
vt.& vi. 使工作;使運作;操作;使產生效果; n. 工作，操作;著作;工廠;行為，事業; vt. 使工作;操作;經營;使緩慢前進;
"to be absent from work"
缺勤
近義：labor, labour, function, process, tool, malleate 反義：idle, laze, loaf, loiter, ramble, roam

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