1. Sir James Clark Ross had obtained a sounding of over 2,400 fathoms in 1839.
    詹姆斯.克拉克.罗斯爵士在1839年就测得一个2400多尺的深度.

2. Sir James Clark Ross had obtained a sounding of over 2,400 fathoms in 1839, but it was not until 1869, when H. M. S. Porcupine was put at the disposal of the Royal Society for several cruises,
    1839年，詹姆斯.克拉克.罗斯爵士曾测得海水深度超过2，400英尺；但直到1869年，皇家学会用英国"豪猪"号舰艇进行了几次巡航后，

3. So was born the echo-sounding apparatus, now in general use in ships.
    这样就产生了目前各种船舶上普遍应用的回声探测仪。