英语语法分析

He was able to estimate the annual increment of salt to the oceans.

他能够估算出海水中盐分的年增量。

They sighted each pole, reading off measurements that were then used to calculate the change in elevation over each increment.

他们瞄准了每个极点，读出测量值，然后用这些测量值来计算每个增量上的海拔变化。

Surveyors marched inland from the coast for thousands of miles, stopping at increments of as little as a few feet to measure their elevation, and marking each increment with two poles.

测量员从海岸向内陆行进数千英里，每增加几英尺就停下来测量海拔，每增加一英尺就用两根杆子做标记。