There is a distinct difference in the strengthcharacteristic of brittle materials between single impact and double impact or slow compression.
脆性材料单次冲击和二次冲击或低负荷压缩冲击性能方面有很大的差别。
2
The belief that we can always start over – that things can always be made better – has been a defining characteristic of the United States and, at times, our greatest strength.