流体间的接触面常常是渐变的而不是突变的，形成一个混合液体的过渡带。
The contact between fluids is usually gradual rather than sharp, forming a transition zone of mixed fluid.
住宅的外立面采用了未加工的西伯利亚落叶松饰面，随着时间的推移木材将会逐渐变为银灰色。
The exterior of the house has been clad in untreated Siberian Larch, which is expected to gradually change its colour to silver grey over time.
随着我们逐渐变老，一方面，不断进步的科技的确在加快我们的时间感，除此之外，还有另外一个因素在影响着我们的时间知觉，而且不像科技，对于这个因素我们可以说是束手无策。
Aside from the part that technology plays in speeding up our understanding of time, another factor affects our perception of time as we get older, and it's something we can't really change.
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