It is thought that 70, 000 years ago a dry period caused Red Sea levels to fall and the gap across its mouth to shrink from 18 miles to eight miles.

据认为，7万年前的一段干旱时期造成红海水位下降，跨越海口处的距离从18英里缩小到8英里。

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Dry magnetic separators operation regulation note the main factors are: the feeding layer thickness (give ore amount), vibration slot vibration velocity, magnetic field intensity and working gap, etc.

干式磁选机的操作调节注意的主要因素是：给料层厚度(给矿量)、振动槽的振动速度、磁场强度和工作间隙等。

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New wells will fail to plug the gap left as older fields dry up, despite the investment that 2008's higher prices encouraged.

ECONOMIST: A stable commodity may be about to get more volatile