Facultatively
特许地; 能力地; 偶发地; 兼性地
🗣️ 情景例句
Yes, indeed.
对， 没错。
That's international practice. We can't break it.
这是国际惯例，我们不能违背。
But, in contrast, it is only in modern times that Galileo has become a problem child for historians of science.
但是相比之下，只是在现代对于科学史家来说，伽利略才变成一个新的难题。