Though a number of descents have been made, much of it still remains to be explored.
人们多次进入洞内探险，但至今尚有不少东西有待勘探。
新概念英语第三册
Lesson 42 Modern cavemen
📚 句中词汇解析
从本句中提取的重要词汇
n. 数字;数量;号码;编号;
v. 标号;总计;把…算作;
💡 numer, number 表示”数字”;”计算”,”估算”
"The number of people employed in agriculture has fallen in the last decade."
过去十年，农业从业人数已经下降。
近义：numerate, reckon, recount, sum, tally, cipher
反义：remove, subduct, take, withdraw, deduct
remains
[rɪ'menz]
n. 遗骨，遗体，残骸，残余，遗迹;废墟，遗址，遗迹，剩余（物），余额;
v. 留下( remain 的第三人称单数);保持;留待;仍然是;
💡 re向后+mains留下 →剩余物
"Access to the documents remains restricted to civil servants."
这些文件仍仅限公务员使用.
近义：leavings, leftovers, litter, offal, riddlings, rubbish
conj. 虽然，尽管;即使;纵然;
adv. 可是，但是;不过;然而;话虽这样说;
prep. 但;
"He's the best teacher, even though he has the least experience."
他虽然经验最少，却是最出色的老师。
近义：however, nevertheless, nonetheless, notwithstanding, tho', howbeit
adj. …制的;（人工）做成的，拼成的;虚构的;保证成功的;
v. 使(make的过去式和过去分词);
"He made it absolutely clear."
他把此事讲得一清二楚。
近义：manufactured, produced, done, fabricated, artificial, manmade
adv. 仍，仍然;更，还要;静静地;〈诗〉常，不断地;
adj. 不动的，静止的;不狂暴的，温柔的;没有活力的，死气沉沉的;
n. 平静，寂静;剧照;静止摄影;蒸馏器;
vt.& vi. （使某物）平静下来，安静;〈古〉烧（酒），蒸馏;
conj. 但是;然而;
"Although he's nearly 80, he is still very active."
尽管快80岁了，他还是十分活跃。
近义：hush, appease, lull, assuage, mollify, pacify
反义：incite, perturb, shake, trouble, upheave, upset