doped single crystal

例句：

1. 1. The doped glass is very transparent.
   这种掺杂玻璃非常透明。
2. 2. The doped material has a higher strength than the untreated one.
   这种掺杂材料比未处理的材料强度更高。
3. 3. The doping process is carefully monitored to ensure safety.
   掺杂过程受到严格监控以确保安全。