WordNet

a balloon sent up to test air currents
(law) the determination of a persons innocence or guilt by due process of law; "he had a fair trial and the jury found him guilty"; "most of these complaints are settled before they go to trial"
trying something to find out about it; "a sample for ten days free trial"; "a trial of progesterone failed to relieve the pain" (同)trial_run, test, tryout
an annoying or frustrating or catastrophic event; "his mother-in-laws visits were a great trial for him"; "life is full of tribulations"; "a visitation of the plague" (同)tribulation, visitation
(sports) a preliminary competition to determine qualifications; "the trials for the semifinals began yesterday"
become inflated; "The sails ballooned" (同)inflate, billow
large tough nonrigid bag filled with gas or heated air
small thin inflatable rubber bag with narrow neck
ride in a hot-air balloon; "He tried to balloon around the earth but storms forced him to land in China"
flying in a balloon

PrepTutorEJDIC

〈U〉〈C〉『裁判』,公判,審理 / 〈U〉〈C〉(…の)『試験』,ためし《+of+名》 / 〈C〉企て,試み;努力 / 〈C〉(忍耐・徳・信仰などをためす)試練,苦難 / 〈C〉困りもの,迷惑な(やっかいな)人(もの)
『気球』,軽気球 / (おもちゃの)風船 / (気球のように)ふくれる《+『out』(『up』)》 / (気球のように)ふくれた
気球操縦競技

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/06/23 23:50:43」(JST)

wiki en

A trial balloon is information sent out to the media in order to observe the reaction of an audience. It can be used by companies sending out press releases to judge reaction by customers, or it can be used by politicians who deliberately leak information on a policy change under consideration.

In politics trial balloons often take the form of an intentional news "leak" to assess public opinion. An example was when the New York Times reported in mid-June 2012 that Governor Andrew Cuomo and his staff were deliberating on a plan to restrict hydrofracking to five counties in the 'southern tier' of New York, along the Pennsylvania border, where the Marcellus shale is deepest and drilling is least likely to pollute well water supplies in those aquifers.^[1] Because the proposed change in New York energy law was highly controversial, the Albany Times Union the next day filed a front-page, above the fold story questioning the plan's leak as a "trial balloon" in the headline, which had quickly garnered both criticism and support.^[2]

In another example, a company might announce they are going to release a new computer program in a year, and then read the press coverage for hints on whether or not the product will have appeal in the marketplace. If the coverage is favourable the money will be spent on development, but if not the project can be cancelled before using up resources. A trial balloon under the company's own name is somewhat risky; if too many are "floated" the company risks becoming known as the company that cried wolf, and can find itself being ignored completely. In addition, the company can find that the product being planned is unworkable, leading to the phenomenon of vaporware.

References

^ Hakim, Danny (June 13, 2012). "Cuomo Plan Would Limit Gas Drilling to a Few Counties in New York". New York Times. Retrieved June 13, 2012.
^ Karlin, Rick (June 14, 2012). "Is trial balloon full of shale gas?: A report that Gov. Andrew Cuomo backs limited hydrofracking draws quick criticism, some support". Retrieved June 14, 2012.

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PMID 26159167

Trial of a Paclitaxel-Coated Balloon for Femoropopliteal Artery Disease.

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Japanese Journal

Kinect^<TM>センサーを使った仮想環境が高齢者の運動機能に及ぼす影響について

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The Leipzig Prospective Drug-Eluting Balloon-Registry　– Outcome of 484 Consecutive Patients Treated for Coronary In-Stent Restenosis and De Novo Lesions Using Paclitaxel-Coated Balloons –