Although this situation has occurred in the field, it is one that is rarely observed.
虽然这种情况在该字段中出现过，但是很少观察到。
In some countries that is observed punctiliously. In others it is in effect voluntary.
有些国家严格遵守了这一规定，但另一些国家完全是自愿的。
It is firmly maintained that such regulations should be strictly observed.
人们坚定地认为这些规章应该严格遵守。
It is observed that the crack impermeable model can be used under some condition.
结果表明，裂缝不可渗透的边界模型在一定条件下可以合理使用。
It has observed that the blending system is a non-Newtonianpseudoplastic fluid.
结果表明，该共混体系为假塑性非牛顿流体。
It is observed that there is potential on verbal humor research from cross-cultural perspective.
可见从跨文化的角度对言语幽默进行研究还存在着一定的潜力。
It is also observed that a sudden shake can promote gas migration.
外界突发性的振动能够增加天然气运移的有效性。
It is also observed that a sudden shake can promote gas migration.
外界突发性的振动能够增加天然气运移的有效性。
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