Holing
[采矿]掏槽落煤法, [建]石板瓦钻孔
🗣️ 情景例句
This is a little difficult for her.
这对她来说有点不习惯。
He who is afraid of asking is ashamed of learning.
害怕问者耻于学。
Sometimes the secrecy goes to such an extent that the whole nature of the research cannot be mentioned.
有时，保密竟达到了这样的程度，即连研究工作的整个性质都不准提及。