1.
Many common minerals, such as feldspar, develop microscopic pits during weathering.
许多常见矿物（例如长石）会在风化过程中发展出微小坑洞。
2.
Each tiny chamber in each rock on the early earth could have housed a separate experiment in molecular self-organization.
早期地球的岩石上，每个小坑洞都可能各自进行分子自我组装实验。
3.
An indentation or small hollow.
凹处凹陷处或小洞小坑
4.
Marked by pits.
有坑洼的，有坑洞的
5.
A hole or pit, especially one in a road surface.
坑洞尤指路面上的涡穴或坑洞
6.
Another reason is that kids are notoriously bad at shoring up the sides of deep holes, resulting in inevitable cave-ins once they reach a depth of six inches.
另外，小孩子在挖坑洞时，不会稳固洞旁的土，所以差不多15公分深时，凹洞免不了就塌陷了。
7.
The majority of tombs are small in size, and earth pit or cave in shape. Middle-sized ones are in the form of stone chamber or brick tomb.
墓群以小型土坑墓为主,并有少量土洞墓,中型墓均为砖室或石室墓。
8.
used of paved surfaces having holes or pits.
铺设的表面有洞或坑的。
9.
A natural or artificial hole or cavity in the ground.
坑，洞一个地上天然的或人工的洞或穴
10.
A small cave or cavern.
洞穴小的山洞或洞穴
11.
Desert puddles and mud holes: Water is a preciously scarce resource for all living things in the desert.
沙漠里的水坑和泥泞的洞，对于在沙漠里所有的生物，水是很珍贵和稀小的资源。
12.
Hole strategy： Avoid the bunker on the left of the green.
球洞攻略：要避开果岭左侧的沙坑。
13.
The ice cap is cut by deep troughs and chasms;
冰冠被深深的波谷和坑洞所切开；
14.
Construction method of the circle-shear type portal of the Senkeng second tunnel
森坑二号隧道圆切式洞门的施工方法
15.
A little leak will sink a great ship; A stitch in time saves nine
小洞不补,大洞吃苦
16.
By timely mending saves much spending.
小洞不补，大洞难堵。
17.
There are several puddles on the playground.
操场上有许多小水坑。
18.
Mind you don't tread in that puddle.
小心, 别踩着那水坑.