Black leader
【矿物】石墨，笔铅，黑铅
🧩 词语组成解析
black
[blæk]
adj. 黑（色）的;黑色人种的;黑暗的;不加牛奶的;
n. 黑色;黑人;黑颜料;黑暗;
v. 使变黑;抵制;拒绝;使变黑暗;
🗣️ 情景例句
What about the baby?
那小宝宝怎么办？
A good name keeps its luster in the dark.
良好的名声在黑暗中也能闪闪发光。
so every so often a sample is obtained with a coring bit.
因此时常要用取芯钻头取样。