EditText中baseline是什么意思

梯形的上底的英文 梯形的下底的英文可以用baseline,那上底呢?
梯形的下底的英文可以用baseline，那上底呢？

英语翻译
The baseline position
肯定不是直接翻译,应该是个俗语什么的吧,
下面是这句话的上下文：
.
For example,PARS is putting this into practice for the world's largest mail company,the United States Postal Service (USPS).
The baseline position(原文这里是加重的,感觉向标题一样)
The USPS serves one of the most mobile markets in the world,with about 17 per cent of US citizens moving house every year.This resulted in 40 million address changes in 2001 alone.The number of wrong deliveries caused by out-of-date addresses being used is correspondingly high,with 1.3 billion letters being returned to sender each year.That means high costs for the postal service and the annoyance of late deliveries for their customers.
.

英语翻译
原文：




译文：
Entire Project
在第一次保存baseline的时候
Select Task
在保存完的baseline里,将re-plan（追加、更新、删除）过的task的baseline添加的时候

谁帮忙翻译一下这个短语 The baseline position
谁帮忙翻译一下这个短语：
The baseline position
肯定不是直接翻译,应该是个俗语什么的吧,谢谢了先.
...........
For example, PARS is putting this into practice for the world's largest mail company, the United States Postal Service (USPS).

The baseline position(原文这里是加重的，感觉向标题一样)
The USPS serves one of the most mobile markets in the world, with about 17 per cent of US citizens moving house every year. This resulted in 40 million address changes in 2001 alone. The number of wrong deliveries caused by out-of-date addresses being used is correspondingly high, with 1.3 billion letters being returned to sender each year. That means high costs for the postal service and the annoyance of late deliveries for their customers.
......

英语翻译
Schedule variance pct
Baseline finish
Actual cost
Schedule status
Cost status
Cost variance
Baseline cost
Cost variance pct
Baseline cost

This way在句中的成分?
This way we raised the baseline of our everyday level.