![WASHINGTON,March13—When17-year-oldMaryMastermansetoutto...]( "WASHINGTON,March13—When17-year-oldMaryMastermansetoutto...")
- 问题详情：WASHINGTON,March13—When17-year-oldMaryMastermansetouttobuildaspectrograph（摄谱仪）,sheknewitwouldbenoeasytask.Thedevice,aninstrumentusedtoidentifycharacteristicsofdifferentkindsofmolecules,cancostthousandsofdollars,andMarywasbuildingonabudget....
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