The roaring waters leaped high to meet them . 波涛怒吼，高相迎。
2.
The a phase can change to b phase by stretching . in the range of low temperature the higher content of b crystalline was achieved during the higher drawing ratio and the higher drawing temperature 拉伸有利于pvdf纤维的相结晶向相结晶转变，且拉伸倍数越高相含量越高；较低温度区域内( 100 ) ，温度提高有利于相结晶向相转变，较高温度区域内( 100 ) ，温度提高对相向相转变作用不大。
