limitrn.限制者；限制物；[电子]限幅器limitn.限度；限制；界限vt.限制；限定limit of endurance持久限度limit of tolerance公差限度limit of diffusion扩散极限limit mining depth极限开采深度limiting character极限特性limit of precision精确极限limiting dimension极限尺寸,外形尺度limiting mechanism限制机构limiting nutrients限制性营养limit of seed size晶种粒度范围

1. This is an extreme case, generally complete extinction does not occur.
   这是一种极限情况，一般说来，并不致发生完全熄火。
2. We can approach the limiting case of free propagation by allowing the aperture dimensions to increase indefinitely.
   让孔的线度无限增大，我们就能趋近于自由传播的极限情况。