例句與造句

1. The fourth sump has been dived for to an underwater boulder choke.
2. In September 2006 cavers squeezed through an excavated boulder choke into new passage.
3. The cave sometimes floods, with a sump forming beyond the first boulder choke.
4. Downstream, the team reached a terminus at a prominent boulder choke, through which they attempted to dig.
5. Boulder chokes can be formed by rockfall, massive earth movement, mining debris, or deposition after storms.
6. It's difficult to find boulder choke in a sentence. 用boulder choke造句挺難的
7. The underground debris from the collapse forms the Big Rapids and is responsible for the boulder chokes seen near Blank Passage.
8. Originally accessed through a vertical boulder choke, an access tunnel has been cut to include it on the visitor trail.
9. The stream runs through the cave until it comes to a boulder choke which has so far proved to be impenetrable.
10. Boulder chokes can present a significant danger to cavers, as unstable boulders can unexpectedly move, potentially crushing or trapping cavers.
11. Passing a little further through a few boulder chokes brings you through many wonderfully decorated chambers and eventually to the Hall of 30.
12. Due to the nature of their formation boulder chokes may be unstable and can prove difficult to navigate and map due to their complexity.
13. In order to clear a boulder choke the rocks obstructing the passage must be broken up and removed, either mechanically or using a small explosive.
14. Also, In caves prone to flooding, the narrow and contorted path through boulder chokes can fill up with water quickly, preventing movement past the choke
15. A levelled floor reaches a boulder choke, which once had a flight of steps leading over it; this is now covered by a boulder collapse.
16. There is a fixed ladder at the first boulder choke and climbing aids at the second boulder choke, but otherwise cavers need to provide their own tackle.
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