In North America, clinker accounts for about 90% of cement due to safety standards.

在北美，由于安全标准，熟料约占水泥的 90%。

The Lapita left precious few dues about themselves, but Efate expands the volume of data available to researchers dramatically.

拉皮塔人留下的关于他们自己的宝贵资料很少，但 Efate 极大地扩展了研究人员可用的数据量。

As the president spoke, flights to New York City area airports were suspended for about a half hour due to virus-related staffing issues at an air traffic control center.

在特朗普发表讲话时，飞往纽约市各大机场的航班暂停了近半小时，因为新冠病毒导致空中交通管制中心出现了人手安排的问题。