Exact(3)
Several shale basins have never yielded natural gas, and the productivity of others is difficult to predict.
Several rounds of negotiations with the jihadist movement have been pursued in recent years but they have never yielded calm, partly because of Boko Haram's internal divisions.
However, critics say such efforts have "never yielded a tangible peace benefit" (151, p. 222) and have been driven more by "ideology" than evidence of effectiveness (152, p. 1020).
Similar(57)
In the United States, it is one of only three sports that has never yielded an Olympic medal (the other two: badminton and team handball).
"The language of threat and pressure against the Iranian nation has never yielded results but will lead to more seriousness in the attitude of the Iranian nation," he said.
Bennett's own electoral history has never yielded a seat – she failed in two attempts to be elected as a Green councillor in Camden, was not elected to the London assembly in 2012 and took 2.7% of the vote in the 2010 general election in Holborn and St Pancras, where she will stand again in May.
Because it is lightweight and inexpensive, aluminium has attracted interest from battery engineers for many years, but it has never yielded a viable product.
The opener idea seems to be latest iteration of an ongoing game of musical chairs that has never yielded any real results when it comes to winning.
Responding to criticism that the electoral system falls short of "international standards", the China Daily points out that a premature introduction of Western-style democracy into many countries has never yielded the intended results.
Technicolor, which was founded in 1915 and pioneered the development of color film technology, has never yielded leadership in the field to newer competitors.
Although some writers claimed that the studies had never yielded any useful results, an official review concluded that a statistically significant effect had been demonstrated in the laboratory, but that there was no case in which ESP had provided data that had been used to guide intelligence operations.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com