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31. This dictionary is an invaluable reference tool for advanced learners.

32. The waterway has proved an invaluable asset.

33. And he's been invaluable in organizing the present conference.

34. Kent has been of invaluable assistance to us.

35. Being able to rely on advice can be invaluable.

36. Martin's marketing expertise has been invaluable to our project.

37. For it to be expert opinion is invaluable.

38. A student of Plato, Xenocrates[sentencedict.com], does provide invaluable help.

39. His work as a leading founder member was invaluable.

40. An old bath tub for this purpose is invaluable.

41. They received invaluable technical advice from architect Colin Humphrey.

42. Callihan's organization and leadership has been invaluable.

43. Margaret's sensible suggestions have been invaluable to us.

44. His engineering skills and technical ingenuity were invaluable.

45. Trade unionists' advice and explanations concerning such issues as health and safety are invaluable in this context.

46. Classroom instruction is invaluable in providing some of this background and in giving the learner confidence.

47. There is sometimes reluctance by solicitors and relatives to use the procedure, but it can be invaluable.

48. The books demystify language teaching theory, and provide invaluable background knowledge which will extend professional skills.

49. Indeed,(http://sentencedict.com/invaluable.html) working directly with consultants proves invaluable in gaining access to high-quality morbidity data.

50. The Council appreciates their support of the programme and the invaluable help provided by the local centres which run the courses.

51. Equip yourself with Another Hong Kong - invaluable for anyone determined to get off the beaten track.

52. Another factor here has been the slow but invaluable installation of Traffic Collision Avoidance System radar in commercial airliners.

53. Working in a manufacturing company, or as a solicitor or chartered accountant gives invaluable experience.

54. I use a very small one that looks like a pencil or pen. Perspex rulers are invaluable.

55. This provides an invaluable source of information on causes of death and trends over time.

56. He was another to give invaluable advice to my son whose fascination for planes had never lessened.

57. We will continue to depend heavily upon their help for the foreseeable future and gratefully acknowledge their invaluable help.

58. There is not yet a single simple method of detecting cancer, yet this would be invaluable.

59. Because transplanted quail cells will behave normally in chick embryos, she realized she had an invaluable natural marker.

60. Once again, Gould's ability to pick his team was to prove invaluable.