问题描述：
呃呃
最佳答案： certainly的意思是肯定，当然，无疑，确定。
certainly的同义词有：sure、without doubt、of course、that's to be sure 。这些词都是表肯定，当然的意思。
certainly的反义词是uncertainly，意思是犹豫不决地，没把握地。
造句：
1、Several countries certainly hope so.
几个国家当然希望如此。
2、I certainly never expected to become a writer.
我当然没想到会成为一名作家。
3、It is certainly true that there are .
确实如此。
4、This car is certainly not mine.
这辆车确实不是我的。
5、The climate in Russia is interesting but certainly cold.
俄罗斯的天气有趣但是当然很冷.
