rock boring इन हिंदी

rock: पत्थर पहाड़

boring: बरमाना वेध बोरिंग

	1.	It is rock bored and stone lined.
	2.	The soft-soil tunnels are in contrast to the hard-rock bored tunnels south of 92nd Street and the cut-and-cover tunnels north of that point ( necessitated because Manhattan's rock profile drops sharply north of 92nd Street ).

अंग्रेज़ी→नहीं। नहीं।→अंग्रेज़ी