而这时，吴水森母亲的视力急剧下降，难以制作出要求精密度高的罗盘。
And then, Mr Ng Shui-Sen sharp decline in the mother's vision, it is difficult to produce high-precision requirements of the compass.
而这时，吴水森母亲的视力急剧下降，难以制作出要求精密度高的罗盘。
And then, Mr Ng Shui-Sen sharp decline in the mother's vision, it is difficult to produce high-precision requirements of the compass.
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