Rate of penetration
[經] 鉆井速度, 機械鉆速
?? 詞語組成解析
rate
[reit]
n. 速度;比率;等級;（利息等的）費率;
vt. 估價;值得;責罵;定級;
vt.& vi. 認為，把…算作;
vi. 被評價;被認為;被列入;申斥;
of
[?v]
prep. 關于;屬于…的;由…制成;
aux. 助動詞 [非標準用語、方言] =have [主用于虛擬語氣];
penetration
[,p?n?'tre??n]
n. 滲透;穿透;[軍]突破;洞察力;
??? 情景例句
Let's all just enjoy this wonderful place
讓我們大家就來享受這個美妙的地方
What has the captain ordered us to do?
船長命令我們做那些事？
However, in recent times the old-age pension has only been paid to the poorest people because there has been an increase in the number of people out of work.189
然而陽近一段時間，老年養(yǎng)老金只付給那些最窮的人，因為失業(yè)的人數一直在增長。