These amplifiers have long been made with tiny election tubes.

这些放大器是用微型电子管制成的。

youdao

These amplifiers have long been made with tiny election tubes .

这些放大器是用微型电子管制成的。

youdao

These amplifiers have long been made with tiny election tubes .

这些放大器是用微型电子管制成的。

youdao