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常用词语和结构有:
always 始终,一直,永远
almost always 几乎始终,几乎一直
generally, usually 通常
often, frequently 时常,常常,频繁地
as often as not 往往
sometimes, at times 有时
occasionally, from time to time, not often 偶尔,有时,时时
rarely, seldom, hardly/ scarcely ever 很少,难得,几乎从不
never 从来没有
many times 多次地
twice 两次
once 一次
at intervals of + 数词 + 时间名词 间隔…(时间),每隔…(时间)
every + 数词 + 时间名词 每隔…(时间)
New ideas are always coming out in science.
科学上的新思想一直在不断出现。
Black-and-white photographs are generally used in air-mapping.
黑白照相通常用于航空测绘。
The air cleaner should be checked weekly on most tractors, and in dusty conditions more
frequently .
大多数拖拉机上的空气净化器每周均应检查一次,在多尘土情况下次数应更多一些。
The compression in the cylinder of an engine must be checked from time to time. It must be checked periodically .
发动机汽缸中的压缩情况应时时检查。应定期地检查。
Progress in a given 1ine of research sometimes , but not always , depends on the develop ment of
new types of instruments .
某一特定研究领域的进展有时(但不是总是)取决于新型仪器的研制。
In spite of the widespread occurrence of volcanoes , volcanic energy is hardly ever used as a
source of power .
尽管火山分布很广,火山的能量几乎从不用作动力源。
Up to now , atomic energy has never been used for aircraft propulsion .
到目前为止,原子能一直未用于飞机推进。
The coil will be in this position twice in every complete revolution.
每旋转一周,线圈将两次处于这一位置。
The results of the investigation were not conclusive since the crucial experiment had been
performed only once and had not been repeated .
研究的结果还不是结论性的,因为决定性的实验只进行过一次,未重复做过。
The temperature of the water is read every five minutes .It is read at intervals of five minutes / at
five-minute intervals .
水温每隔 5 分钟读取一次。读取的间隔时间为 5 分钟。
Some power plants are designed to run continuously , without stopping . Other plants are designed for intermittent use , frequently starting and stopping .
某些动力装置被设计用于连续不停地运行,而有些则供间歇地使用,时常开机或停机。
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