单词：optional nature
optional nature的用法和样例：
例句
- It takes, for example, a highly selective view of the kindliness of nature.比如，它会采用大量有选择性的关于自然友好的观点。
- MSW 3.6 The order of swimmers by gender is optional in mixed relays.在混合性别接力比赛中，队员的性别顺序是选择性的。
- But under a new reform, history will become optional, letting budding scientists retreat behind their Bunsen burners untroubled by the cold war or anti-colonialism.在这一项新的改革中，历史变成了非强制性的，这使得那些初露头角的小科学家们可以不用理会冷战和反殖民主义而自由的沉浸在他们自己的发明中。
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