Preallocated
[计] 预分配的
🗣️ 情景例句
Hello, ... speaking. Who do you wish to speak to?
喂， 我是……你想找谁？
Know something like the palm of one's hand.
熟知其事，了如指掌。
Come up these steps with me, please, and be careful.
请跟我走上这些台阶，请小心点。