新发现的基因对科学家们就老年人患上老年痴呆症的病因理论发起了挑战。
The newly discovered genes have challenged scientists' thinking on how Alzheimer's disease develops in older people.
委员会支持奥巴马的呼吁，他说‘担负起我们各自的责任，发起全世界的回应，因对全球性的挑战。’
The Committee endorses Obama's appeal that 'now is the time for all of us to take our share of responsibility for a global response to global challenges.'
客户端的主要挑战是对发起请求（fork）和合并响应（join）的聚合、并行处理和编排。
The [main] client app’s challenges are aggregation, parallelization, and orchestration of forks and joins.
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