Certain keys were hanging on the wall, to which he now added the gate key; and his patchwork-covered bed was in a little inner division or recess.

墙上挂着一些钥匙，现在他又把门钥匙加了起来：他的拼凑覆盖的床是在一个小内部分裂或休会。

In the early 8th century, Johann Christoph Denner, a German instrument maker, improved the chalumeau by adding a register key, enabling the instrument to produce higher notes.

8 世纪初，德国乐器制造商 Johann Christoph Denner 通过添加注册键改进了 chalumeau，使乐器能够发出更高的音符。