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Using both hands, mould noseclip to the shape of the lower part of the nose, do not pinch the nosepiece using only one hand as this may result in less effective respirator performance. 用两只手，调整鼻梁夹的形状。不要只用一只手去捏鼻梁夹，这样可能会导致呼吸器效力减轻。