retention

英[ri'tenʃən]美[ri'tenʃən]

n.[U]
1.保留，保持
2.【医学】潴留
3.记忆，记忆力

同：	[n.] holding, keeping, memory, retentiveness

This overall deterioration in soil structure is usually accompanied by a reduced nutrient retention capacity
这种土壤结构的全面恶化，通常伴随着养份保持能力的降低。收藏
Academic Failure: “Social Promotion” Versus Retention as Education Policy
学业失败:“社会性升级”与教育政策留级之争收藏
An abnormal distention of body tissues caused by retention of air.
气肿因空气滞留而引起的体组织的不正常的扩张收藏
The physics and theory of interception and retention of fine particles by vegetation are well beyond the scope of this book
植被对微粒的阻截和滞留的物理学原理和理论不属于本书范围。收藏
Tool shanks with 7:24 taper for automatic tool changers—Retention knobs for shanks Nos. 40, 45 and 50
自动换刀机床用7:24圆锥工具柄部40、45和50号圆锥柄用拉钉收藏

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