Mr. Ballmer said the company's most significant challenge remained finding and keeping talented people.
There are significant challenges remaining, however, before working devices using this method appear.
Although nanopore DNA sequencing has good maneuverability, there are still significant challenges remaining to be overcome.
While substantial progress has been made in the science and policy fields related to SFM internationally, a number of significant challenges remain.
The report notes that a number of significant challenges remain, including improved planning, sustained leadership and reliable long-term funding.
Despite the gratifying progress made over the past two decades in developing more effective means to prevent CINV, a number of significant challenges remain.
Although mining companies have adopted the principles of corporate social responsibility and are taking positive steps to be more responsible at a local level, many significant challenges remain.
From a monitoring and evaluation perspective, significant challenges remain in defining and measuring the available workforce with a broader skill set across countries and over time within countries.
And although many significant challenges remain, an experimental type of rechargeable battery that's like a fuel cell could increase battery storage that much more.
At each stop, Mr. Panetta acknowledged that significant challenges remain to an orderly withdrawal and a stable postwar Afghanistan, and not just the resilient insurgency.
Lucinda Morrison, head of press at the National Theatre, which was singled out by Equity for responding "very seriously" to the issue, said the theatre shared a desire for equal representation, but significant challenges remained.
