pteryla

例句：

1. 1. The oyster is a shellfish that producespteryla.
   牡蛎是一种产生珍珠的贝类。
2. 2. The pearl was carefully polishedto reveal its pteryla.
   这颗珍珠被仔细打磨以显露其珍珠层。
3. 3. The ancient Egyptians believed in thepower of pteryla to bringgood luck.
   古埃及人相信珍珠具有带来好运的力量。