Trivalency
n. 三价
✅ 同义词
🗣️ 情景例句
Are you the oldest in your family?
你是你家里最大的孩子吗？
That was a close call.
太危险了。
But instruments far more delicate than that were needed if any really serious advance was to be made.
但是，如果要取得真正重大的进展，需要有比这种装置精细得多的仪器。