the safe period

time just before and during a woman's period when sexual intercourse is unlikely to make her pregnant 安全期（妇女受孕可能性极小的时期）.

the poor, the positive, the press, the Press Association (abbr 缩写 PA), the priesthood, the public, the Queen's English, the rag trade, the rank and file, the ravages, the Redeemer, the Revised Standard Version, the Revised Version, the rich, the Right, the rising generation, the roadway, the roll call, the Roman alphabet, the sack, the same, the same as, the sandman, the second coming, the Security Council, the seventh day, the small hours, the solar system, the solar year, the Son of God, the Son of Man, the Soviet Union, the Spanish Main, the splits, the Stars and Stripes, the State Department, the sterling area, the Stone Age, the sulks, the supernatural, the Supreme Court,