因此，我们不能把语句“能量是守恒的”做为一个绝对的陈述。

As a consequence, we cannot turn the statement "energy is conserved" into an absolute statement.

youdao

它们通常被表示为“系统应做…”形式的陈述语句。

They are usually expressed as declarative statements in the form of "the system shall do..."

youdao

这是本例子第一次把关联作为一个定义表达式(换句话说，一个赋值语句)的声明性陈述来使用，而不是用它作模型到模型的映射。

This is the first time that this example is using a relation as a declarative statement to define an expression (in other words, a value assignment) instead of using it for model-to-model mapping.

youdao