这样的加厚允许木质部在环间沿展，当周围组织生长时，不会破裂。
Such thickening allows extension of the XYLEM between the rings so that it is not ruptured as the surrounding tissues grow.
结论TV-CDFI是鉴别“输卵管环”与妊娠黄体的有效方法，有助于未破裂型输卵管妊娠的早期诊断。
Conclusions TV-CDFI is an effective method to differentiate "tubal ring"and corpus luteal of pregnancy. It is useful in early diagnosis of UTP.
采用环向约束试验方法研究破裂岩体的承载和变形特性。
The carrying capacity and deformation characteristics of cracked rock mass were investigated by hoop constraint tests.
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