常用詞語和結(jié)構(gòu)有：
always 始終，一直，永遠
almost always 幾乎始終，幾乎一直
generally， usually 通常
often， frequently 時常，常常，頻繁地
as often as not 往往
sometimes， at times 有時
occasionally， from time to time， not often 偶爾，有時，時時
rarely， seldom， hardly／ scarcely ever 很少，難得，幾乎從不
never 從來沒有
many times 多次地
twice 兩次
once 一次
at intervals of + 數(shù)詞 + 時間名詞 間隔…(時間)，每隔…(時間)
every + 數(shù)詞 + 時間名詞 每隔…(時間)
New ideas are always coming out in science．
科學(xué)上的新思想一直在不斷出現(xiàn)。
Black-and-white photographs are generally used in air-mapping．
黑白照相通常用于航空測繪。
The air cleaner should be checked weekly on most tractors， and in dusty conditions more
frequently .
大多數(shù)拖拉機上的空氣凈化器每周均應(yīng)檢查一次，在多塵土情況下次數(shù)應(yīng)更多一些。
The compression in the cylinder of an engine must be checked from time to time． It must be checked periodically ．
發(fā)動機汽缸中的壓縮情況應(yīng)時時檢查。應(yīng)定期地檢查。
Progress in a given 1ine of research sometimes , but not always , depends on the develop ment of
new types of instruments .
某一特定研究領(lǐng)域的進展有時(但不是總是)取決于新型儀器的研制。
In spite of the widespread occurrence of volcanoes , volcanic energy is hardly ever used as a
source of power .
盡管火山分布很廣，火山的能量幾乎從不用作動力源。
Up to now , atomic energy has never been used for aircraft propulsion .
到目前為止，原子能一直未用于飛機推進。
The coil will be in this position twice in every complete revolution．
每旋轉(zhuǎn)一周，線圈將兩次處于這一位置。
The results of the investigation were not conclusive since the crucial experiment had been
performed only once and had not been repeated .
研究的結(jié)果還不是結(jié)論性的，因為決定性的實驗只進行過一次，未重復(fù)做過。
The temperature of the water is read every five minutes .It is read at intervals of five minutes / at
five-minute intervals .
水溫每隔 5 分鐘讀取一次。讀取的間隔時間為 5 分鐘。
Some power plants are designed to run continuously , without stopping . Other plants are designed for intermittent use , frequently starting and stopping .
某些動力裝置被設(shè)計用于連續(xù)不停地運行，而有些則供間歇地使用，時常開機或停機。
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