It's difficult to keep track of all this shifting research.
很难记下所有这些转变的研究。
The result is a shifting, difficult landscape only barely understood even by insiders.
结果就出现了只有内部人士才能理解的、变了味的复杂格局。
Shifting dullness and a fluid wave are more difficult to elicit and require more ascites.
移动性浊音和流体波更难引出而且需要更大量的腹水。
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