HPV疫苗的问世是预防子宫颈癌的重要事件，可形成一级预防。

The licensing of HPV vaccine is an important event in cancer prevention, and this vaccine can be used for the primary prevention.

但我们也在公共健康领域观察到了，比如，目标明确的三级、二级预防效果比范围广泛的一级预防更好。

But we also saw this in public health, where targeted tertiary and secondary prevention performed better than more generalized primary prevention.

然而，这种疗法在一级预防方面的好处有限。研究表明，服用阿司匹林必须权衡利弊，防止出血的危险。

However, evidence in primary prevention is limited, with studies suggesting that any benefit of aspirin must be weighed against the risk of bleeding.

心血管疾病的发病是多种危险因素共同作用的结果，故其科学的整体危险评估和危险分层在心血管疾病一级预防非常重要。

A variety of risk factors result Angiocardiopathy jointly, and then scientific overall risk assessment and risk stratification become very important in primary prevention of angiocardiopathy.

实际上，这也是对高血压病的一级预防措施。

In fact, this is the level of hypertension prevention.

目的：探讨饮食在癌症“ 一级预防”中的意义和措施。

Objective To discuss the meaning and measures of diets in the first-grade prevention of cancer.

一级预防使早期粥样硬化消退，特效降脂药也可使中、晚期粥样硬化患者明显受益。

Primary treatment makes early AS regression. Cholesterol-lowering agents also decrease morbidity of acute events in advanced AS.

虽然在一级预防时心力衰竭的诊断并不准确，但有很好的证据基础进行干预以提高诊断。

There is however, a good evidence base for interventions to improve prognosis although the diagnosis of heart failure in primary care is often inaccurate.

本研究目的是通过对相关随机实验进行荟萃分析，来评估叶酸补充治疗在卒中一级预防中的有效性。

Our aim was to do a meta-analysis of relevant randomised trials to assess the efficacy of folic acid supplementation in the prevention of stroke.