The unusual presentation on malaria prevention was confirmed by the Bill and Melinda Gates Foundation's media office.
约莫一分钟后，盖茨向观众保证被释放的虫子并没有携带疟疾病原。比尔和梅林达盖茨基金会的媒体办公室证实了这次不寻常的预防疟疾演示。
A bill is payable on demand which is expressed to be payable on demand, or at sight, or on presentation; or in which no time for payment is expressed.
即期汇票指载明即期付款，或见票即付或提示即付之汇票；或未载明付款日期之汇票。
A bill is payable on demand which is expressed to be payable on demand, or at sight, or on presentation; or in which no time for payment is expressed.
即期汇票指载明即期付款，或见票即付或提示即付之汇票；或未载明付款日期之汇票。
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