certain factors that determine the ease with which social changes occur什么意思?

certain factors that determine the ease with which social changes occur什么意思? it seemed certain that THAT CERTAIN FEELING怎么样 造句it is certain that. One thing certain,that is certain certain certain i____was happy to hear that news.(certain) 生物和英语好的来帮我回答问题（问题要用英文回答.要准确）1.what world meansa thin layer2.what world meansallowing only certain things to pass3.what are teo factors that decide if something can pass through the cell4.what it seemed certain that their plane would crash这里可以去掉 certain that It's certain that it's sure that区别,语法, be. sure. that.. 和 be certain that .. 哪个对? That she will come is almost certain.可不可以改成She will come that is almost certain.呢还是It is almost certain that she will come. 能换一种方式表达吗?The factors that determineThe factors that determine thoseventures that will become valuable investments things like the demand for the newproduct There are many factors that account for the phenomenon.这句that能否省略 Influences that affect the process和factors that affect the process有什么区别? 英语翻译 That he will come to the party is certain