贝尔电话实验室 meaning in English

[美国] btl (bell telephone laboratory)

In 1948 to be exact, a new device, the transistor, was announced by bell telephone laboratories .
确切地说，是在1948年，贝尔电话实验室把一种新的元件晶体管公诸于世。
Then, in 1948 to be exact, a new device, the transistor, was announced by bell telephone laboratories .
确切地说，是在1948年，“贝尔电话实验室”把一种新的元件--晶体管公诸于世。
Btl bell telephone laboratories
贝尔电话实验室
In 1948 to be exact , a new device , the transistor , was announced by bell telephone laboratories
确切地说，是在1948年，贝尔电话实验室把一种新的元件? ?晶体管公诸于世。
Then , in 1948 to be exact , a new device , the transistor , was announced by bell telephone laboratories
确切地说，是在1948年， “贝尔电话实验室”把一种新的元件- -晶体管公诸于世。