Concavities
n. 凹面, 成凹形( concavity的名词复数 )
🗣️ 情景例句
We have another appointment on the same day.
我们那天有另外一个约会。
An empty hand is no lure for a hawk.
空手诱不来老鹰。
so that there are heavy odds in favour of our dying between the ages of sixty-five and eighty.
我们最可能死亡的年龄在65至80岁之间，