The fissure lens group, in en echelon arrangement, is ease to be developed and conserved in the weak strain domain of tectonic lens.

透镜状裂隙群之间呈雁列式排布，易发育和保存于构造透镜体弱应变域中。

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As ETFs have exploded in popularity, they also have become the source of concern that the structure distorts prices or would break under the strain of investors bailing out en masse.

WSJ: Gold ETFs Shine in Midst of Tumult