这个领域一直应受那些很难导出可靠统计学的结论的小规模，不透彻的研究困扰着。
The field is plagued by small, weak studies that are hard to turn into statistically robust conclusions.
但目前我国大跨度钢拱桥的理论研究仍不透彻，且存在诸多争议。
However, the theory research of long-span steel arch bridge of our country is not thoroughly, and disputed.
它是通过重组其它染色体上的DNA序列来加长端粒的，我们对其研究的并不透彻。
The less understood ALT pathway lengthens telomeres through recombination with DNA sequences from other chromosomes.
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