洞穴勘查——或洞穴勘探——是一項(xiàng)比較新的體育活動(dòng)。

　　劃線是修飾前面的or potholing的。

　　2、 For him, caves have the samepeculiarfascination which high mountains have for theclimber.

　　對(duì)洞穴探險(xiǎn)者來(lái)說(shuō)，洞穴有一種特殊的魅力，就像高山對(duì)登山者有特殊魅力一樣。

　　劃線處類比說(shuō)明。

　　3、 The cave might never have beendiscovered had not the entrance been spotted by thedistinguished Frenchpotholer, Berger.

　　若不是法國(guó)著名洞穴探險(xiǎn)家伯杰由于偶然的機(jī)會(huì)發(fā)現(xiàn)了這個(gè)洞口的話，這個(gè)洞也許不會(huì)為人所知。

　　劃線部分的語(yǔ)法：省略if的條件句，表達(dá)虛擬語(yǔ)氣。正常語(yǔ)序

　　If the entrancehad not been spotted by the distinguished French phtholer, Berger, thecavemight never have been discovered.

　　4、 They had to edge their way along this, sometimes wading acrossshallow streams, orswimming across deep pools.

　　他們不得不側(cè)著身子往前走，有時(shí)過(guò)淺溪，有時(shí)游過(guò)深潭。