如题，这几个句子来源于外文期刊的格式要求：
句1.Type your main textin 10-pointTimes New Roman, single-spaced with 10-point interline spacing.
single-spaced 说明是单倍行距，但是又 10-point interline spacing是什么意思呢，我把行距调成10点，然后前面就自动变成了多倍行距，我不明白啊~
句2.All printed material,including text, illustrations, and charts, must be kept within the parametersof the 8 15/16-inch (53.75 picas) column length and 5 15/16-inch (36 picas)column width. Marginsare 1 5/16 of an inch on the sides (8 picas), 7/8 of an inch on the top (5.5 picas), and 1 3/16 ofan inch on the bottom (7 picas).
前面一句是讲什么没明白，后面一句应该是左右上下页边距吧
句3.The main title (on the first page) should begin 1 3/16 inches (7picas) from the top edge of the page.
这句话的意思是文章的大标题的上边距是7派卡吗？可是标题怎么有上边距呢？应该整个页面才有边距之说呀~我费解
句4.The second and following pages should begin 1.0 inch (2.54 cm)from the top edge. On all pages, the bottom margin should be 1-3/16inches (2.86 cm) from the bottom edge of the page for 8.5 x 11-inch paper; forA4 paper, approximately 1-5/8 inches (4.13 cm) from the bottom edge of the page.
如果句2中已经有了对页边距的要求，那句4中应该不会再要求页边距吧，那我就不理解了
谢谢好心人！