21. Note that circulating pumps usually do not generate enough pressure to overcome air locks . 22. An ideal solution might be to install an air lock . 23. Atlantis carried up the 6 1 / 2-ton air lock in its cargo bay. 24. My hospital room was small and had a special air lock to prevent infections. 25. The third spacewalk on Thursday will be the first ever from the air lock . 26. The air lock and all the necessary exit procedures appeared to work well Wednesday. 27. To make sure that doesn't happen, visitors go through a series of three air locks . 28. An on-site air lock hospital successfully treated the 65 cases of the bends that occurred. 29. Reilly said as the astronauts headed back to the air lock after completing their work. 30. Their primary job Saturday : hanging one last high-pressure gas tank on the air lock .
