送达率的英文：
Successfully Sent Rate

successfully是什么意思：
adv. 顺利地；成功地

The seat was successfully contested.
成功地争得席位。

Adversity successfully overcome is the highest glory.
成功地克服困难是最大的光荣。

The construction of the new railwayis progressing successfully.
那条新铁路的建设在顺利地进行。

sent是什么意思：
v. send的过去式及过去分词

Full details will be sent on request.
有详细材料备索。

On this occasion the lodge sent a carriage.
为了当晚的演出，支部派了马车来接她。

The patient was sent to the operating room.
这个病人被送进了手术室。

rate是什么意思：
n. 比率，速率；费用
v. 评估；认为；划分等级；值得

cumulative rating
累积收听率

These bonds have an AAA rating.
这些债券的信用度是3A级的。

To rate too low;underestimate.
低估对…估价太低；低估