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同学你好！
在柯林斯字典中，有一条解释是这样的：
You can use place instead of put or lay in certain expressions where the meaning is carried by the following noun. For example, if you place emphasis on something, you emphasize it, and if you place the blame on someone, you blame them. 替代(put)或(lay)，用于(place emphasis on)、(place the blame on)等由其后的名词决定意思的短语中.
所以这里place value on something相当于给something赋值。
e.g. You should place a relatively large value on that variable.
你应该给赋予那个变量相对较大的值。
希望我的回答有所帮助！