if one thing presupposes another , it cannot exist or happen unless the other thing is also true 以…为先决条件
Their spending plans presuppose continued economic growth. 他们的支出计划以经济的持续增长为先决条件。
+that Giving special attention to the weaker students presupposes that the others are willing to work without much support. 给较差的学生以特别关注的先决条件是其他学生愿意在没有多少帮助的情况下用功学习。