1、This thesis discusses CAD for globular indexing CAM mechanism on base of reverse engineering.
本文是圍繞弧面分度凸輪機(jī)構(gòu)CAD中的逆向設(shè)計進(jìn)行的。

2、Even I could see his foot was on base before the throw got there.
我甚至看到球傳到一壘前，他的腳已經(jīng)踏壘。

3、a failure to get on base safely in baseball.
在棒球中安全保持自己地位的失敗。

4、On base of consulting relevant data, field survey was done using normal grassland survey method.
在查閱相關(guān)資料的基礎(chǔ)上，采用常規(guī)草地調(diào)查的方法進(jìn)行了實(shí)地調(diào)查。