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1·Does not have cold shortness, the shape and the size thermostability very is also good, the service life may for 50 years.

无冷脆性，形状和尺寸的热稳定性也很好，使用寿命可以长达50年。

2·I often feel faint, cold feet, shortness of breath and numbness in my legs.

常觉得头晕，脚冷，呼吸不顺，腿还发麻。

3·Symptoms include low energy level and sometimes paleness, shortness of Breath, cold extremities, sore tongue, or dry skin.

症状有精力不足，有时面色苍白、呼吸短促、四肢发冷、舌痛及皮肤干燥。