So women are called actress sometimes, ac-tr-es-s.
有时需要需要把男女演员加以区分。
2
Two kinds of useful topologies, i. e. Q -topology and S -topology on the field of hyperreal numbers are studied. The following results are proved: The space ( tR, Q) is totally disconnected;
研究了超实数域上两种有用的拓扑—Q-拓扑和S-拓扑．证明了以下结果：空间（R，Q）是完全不连通的；
3
S. Bach: Prelude and Fugue for Cello and Piano tr.