Jackbit
可拆式钻头, 活钻头, 岩心钻头, 凿岩机钎子, 手持式风钻钎子
🗣️ 情景例句
What's it about?
是关于什么的？
Why didn't you do it?
为什么你不做？
From 1830 onwards in the USA and from about 1870 in Canada, settlers began to move westwards and to take possession of the plains as their own.
美国自1830年起，加拿大从1870年左右起，殖民者开始向西迁移，并把平原据为己有。