The concept of legal validity is crucial for understanding the nature of law.

当我们谈论一个词的“意义”时，首先我们在谈论一种特定的行为。

Tell the cook of this restaurant with my compliments that these are the very worst sandwiches in the whole world, and that when I ask for a watercress sandwich I do not mean a loaf with a field in the middle of it.

绿色低碳发展不是选择题，而是必答题。