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1·The figures aren't adjusted for seasonal variations.

这些数字未作季节性变化调整。《柯林斯英汉双解大词典》

2·The dial records very slight variations in pressure.

该刻度盘能显示很微小的压力变化。《牛津词典》

3·There are slight variations in these two parameters.

这两个参数有细微的变化。

4·They're gradual variations but their effects can be pretty abrupt.

它们是渐进的变化，但它们的影响可能是相当突然的。

5·Variations in wood density affect vibrations, and therefore, sound.

木材密度的变化会影响振动，因此也会影响声音。

6·Some suggest that variations in the Sun's energy output could account for the ice ages.

有人认为，太阳能量输出的变化可能是导致冰河时代的原因。

7·In fact, dams are primarily a strategy for dealing with annual variations in water levels.

事实上，水坝主要是应对水位年变化的一种策略。

8·The method relies on measuring how chemical variations in drinking water show up in people's hair.

这种方法的依据是测量饮用水中的化学物质在人的头发中的变化。

9·Geomagnetic activity, the natural variations in Earth's magnetic field, it fluctuates in 11-year cycles.

地磁活动是地球磁场的自然变化，其波动周期为11年。

10·There is a growing body of opinion that both these physical variations have a measurable impact on the climate.

越来越多的人认为这两种物理变化对气候都有可测的影响。

(1)calculus of variations[计]变分法