However, it's not clear how this particular bulb has been glowing since it was installed in 1901.

然而，还不清楚这只灯泡自从1901年安装以后是如何发光的。

youdao

However, it's not clear how this particular bulb has been glowing since it was installed in 1901.

然而，还不清楚这只灯泡自从1901年安装以后是如何发光的。

youdao