OSAn.美国光学协会OSabbr.操作系统=（Operating System）osmic anhydride四氧化锇osmotic pressur渗透压osmotic process渗透过程os membranaceum膜(成)骨oscillo-graph示波器oscillating saw摆锯osmium fluoride八氟化锇Osmotic methods渗透式os preparietale前顶骨oscillating bit振荡钻

1. Osler arrived at his solution early.
   奥斯勒很早就想出了解决问题的办法。
2. In his lifetime, Osler read a significant library of books.
   奥斯勒一生中读的书数目相当可观。