so every so often a sample is obtained with a coring bit.
因此時常要用取芯鉆頭取樣。
新概念英語第四冊
Lesson 13 The search for oil
?? 句中詞匯解析
從本句中提取的重要詞匯
n. 樣品，華樣;標本，榜樣;（化驗的）取樣;[信]信號瞬時值;
vt. 取…的樣品，尤指用樣品來檢驗;品嘗;抽樣調查;
adj. 作為代表或范例的;
?? s分開+ample拿，獲得→分開拿出→標本,樣品
"We ask for a sale by sample agreement."
我們要求簽署憑樣品交易的合約。
近義：probe, taste, test, try, essay, pattern
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