godsend

1. N-SING If you describe something as a godsend, you are emphasizing that it helps you very much. 天赐之助; 及时雨['a' N] [强调]

Pharmacists are a godsend when you don't feel sick enough to call the doctor. 有小病痛而又不值得看医生时，药剂师便是最有用的了。