It could interfere interfere with the correct correct development of permant permanent teeth.

吸吮拇指可能会对恒牙的正确生长产生妨碍.

It is indicated that the accumulation of frost heave pressure inside and outside the ice wall is the ultimate reason that the freezing pressure usually exceeds the permant horizontal ground pressure.

分析认为，冻结壁内外部冻胀力的积聚，是冻结压力超过重液水平地压的根本原因。