课后练习：
一、阅读《新实用英译汉教程》第六章第三节(pp.301-316）。
二、翻译下列句子和段落：
1. All the factors can be expressed as complex mathematical equations
which can be solved by a computer to give the optimum equipment minimum
cost.
2. Concrete is produced by mixing together cement, water, and mineral
aggregates. This mixture is placed into a suitable mould, compacted,
and allowed to hard. It is somewhat similar to building stone but
has the advantage that it can be easily moulded into any suitable
shape, and also that it can be conveniently reinforced with steel
rods to improve its structural properties.
3. Speifications are subject to change without notice.
4. If the record player is equipped with an earth lead connect it
to the GND terminal of the unit.
5. Supposing the rated speed is 1,500 rpm, or above, the voltage adjusting
method would be preferably automatic.
6. The new equipment will reduce the error probability by seven times.
7. Properly prepared dried (smallpox)vaccines stored at 10℃ or lower
can retain its potency for several years.
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