When shoes slide across a floor, wave-like deformations of the sole can generate squeaking. The pitch of the squeak depends on the rate at which deformations are generated.
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这个被置换而来的孩子，日后人生轨迹被更大的历史力量再次扭转。越南统一前，杜耀豪的外祖母在越南已建立起中产之家，生活优渥。她惦念着留在家乡刚成年的弟弟，计划将他接到越南，帮他改善生活。然而，1949年的政局剧变，隔断了姐弟团聚的迁移计划。
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