In similar lines, for aerated concrete, the transition zone is between a relatively strong matrix and zero strength voids and thus will be denser and more homogeneous than the interfaces in both normal and lightweight aggregate concrete.
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"You can imagine similar kinds of interactive activities along historical lines, like following the Freedom Trail in Boston," Professor Dede said.
“你可以想象类似的互动活动沿着历史的轨迹进行，比如追随波士顿的自由之路。”Dede 教授说。
Voucher programmes in several American states have been run along similar lines.
补助方案在美国几个州也以类似方式运作。
Vouchers programmes in several American states have been run along similar lines.
美国也有几个州在类似方式实施学券计划。
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