当复制到 s1 的字符串长于 s1 的分配大小（即 BUFSIZE，一个在 stdio.h 中定义的常数）时，就会发生缓冲区溢出情况。
This can happen if the string copied into s1 is longer than the allocated size of s1, which is BUFSIZ (a constant defined in stdio.h).
沉积的薄膜介电常数约为2.0，在可见光区薄膜具有良好的透光性。
The as-deposited film shows a dielectric constant as low as 2.0 and has high transparency in the visible light range.
含高顺磁离子的旋光玻璃具有大的费尔德常数，可见区高透过等优点。
Faraday rotatory glass containing high paramagnetic ion concentration is of the large Verdet constant, transparency in the visible region of light.
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