Validity and feasibility of the finite difference time domain method is demonstrated by the echo-wave signal of a flat bottom hole block.

通过与平底孔试块实际缺陷回波信号的对比，验证了脉冲超声波有限差分法模拟计算的有效性和正确性。

youdao

Please do not block its ventilation hole or hinder its heat dissipation.

切勿阻塞本机散热孔或阻碍本机散热。

youdao

Mount restrictor bar into the restrictor bar groove of upper die, mount adjusting bolt for restrictor bar into the bolt hole in the restrictor bar, then mount lower press block, upper press block.

在上模节流棒槽内装入节流棒，将节流棒调节螺栓装配进节流棒的螺丝孔中，再装配上压块。

youdao

The second suggests that a rod-like plug can block the hole by slipping across it sideways and stopping large ions from passing, rather like a drain cover stops leaves from entering the mouth of a pipe.

ECONOMIST: Synthetic biology: Expanded vocabulary | The

While other attempts are planned to block the hole, it is probable that oil will continue to pour from it for another couple of months, until relief wells are drilled to intersect and reduce the pressure in the currently flowing well and cut-off the leakage of perhaps 50 million barrels of oil contained there by the injection of concrete deep into the seabed.

FORBES: Blame Big Bad BP For Now, but Where Is the Next Oil to Come From?

In part, the decline was down to the collapse of trade with the Soviet block: new trade with China filled only part of the hole.

ECONOMIST: Nomadism in Mongolia