Please make observation.

请注意观察。

Randomly divide 70 cases of cold urticaria patients into 2 groups and make observation and comparison.

将70例寒冷性荨麻疹患者，随机分2组进行对比观察。

When experiments are to be made, one cannot rely too much upon the human senses to make accurate observation.

在做实验时，不能过分依靠人类的感觉去做精确的观察。

When experiments are to be made, one cannot rely too much upon the human senses to make an accurate observation.

做实验时，不能过分依靠人类的感官去做精确的观察。

Every observation we make involves the exchange of energy.

我们所做的每个观测包含了能量的交换。