我们应该对自己的能力有信心。换言之，我们应该确信可以完成它We should have confidence in our ability. In other words ,we should be confident to finish it.
网友回答
(答案→)We should have confidence in our ability. In other words ,we should be confident to finish it.
解析：考察短语have confidence in sth对某事有信心，be confident to do sth有信心去做某事，短语In other words换言之。