格拉福风留声机

Both his mother and his wife were deaf, hence his interest in acoustics. Others had created working phones, but Bell gave us the first commercially practical telephone, as well as the metal detector and the graphophone, an improved version of the phonograph.

亚历山大-格雷厄姆-贝尔的母亲和妻子都是聋子，所以，他对声学很感兴趣，其他人研制了工作电话，而贝尔为我们送出第一个商业实用电话，和金属探测器以及改良版留声机——格拉福风留声机。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。