Translation of "understand clearly" into Chinese

“We now understand clearly that what humans need to survive is, not work or money, but food.

“我们现在明白,人有食物就可以活了,不一定要靠工作或金钱。

The general view was that the limited observations and studies available make it difficult to understand clearly the relationships between climate characteristics and human health.

普遍认为,由于观测和研究成果有限,难以清楚地认识气候特点与人的健康之间的关系。