第四级的

Kun-Yen Ho had treated a 50-year-old female patient, as usual with the habit of drinking vinegar health, dental pain that was later to seek medical treatment, after examination revealed that she had the fourth-class dental etching, exposed more than two-thirds of dentin Second, does not timely processing, pulp nerve may be Louzaiwaimian.

何坤炎曾收治一名50多岁的女性病患，由於平常有喝健康醋的习惯，后来觉得牙齿酸痛前往就医，经过检查发现，她已是第四级牙齿酸蚀，牙本质暴露超过三分之二，再不及时处理，牙髓神经可能就会露在外面。

I have learned the reasons why few engineering students try to reconcile engineering with liberal-arts courses in college.

2000年12月四级考试阅读理解第三篇就是这样的一篇文章。

All three solid-fueled rocket stages of the vehicle have finished qualification testing.

第四级因承担下面级的姿态控制和保证最终入轨精度，技术含量高，发费的时间长些，明年能准时试射吧。

Today Vega consists of three solid motor stages and its AVUM fourth stage that uses storable propellant.

目前的"织女星"火箭由三个固体发动机级段组成，它的AVUM第四级使用易贮存的推进剂。

Lesional and homeochronous normal hips were paired, and acetabular index and AI of lesional and normal hips, before the reduction and in the 3rd, 6th, 9th and 12th month, respectively, after the reduction, were dynamically measured.

按四级功能评价标准判定临床疗效；于复位前、复位后第3、6、9 和12 个月动态测量患、健侧髋关节的髋臼指数（acetabular index，AI）和髋臼深度与宽度比值，并进行相关比较。

This course of fire shall not be included in IPSC sanctioned Level IV or higher competitions.

这种比赛模式不应在IPSC认可的第四级或更高的竞赛中被使用。

In the previous work,a conformational rule was proposed for Hofmann elimination of quaternary ammonium hydroxides.

本文合成了12种含环戊基或环己基的第四级铵碱，使之发生Hofmann消除反应。

The double bass,usually considered amember of the violin family,is tuned in fourths and has the sloping shoulders and flat back characteristic of the viols.

低音提琴通常被算作提琴类，定弦为第四级音，颈部倾斜和背平是低音提琴的特点。

The double bass, usually considered a member of the violin family, is tuned in fourths and has the sloping shoulders and flat back characteristic of the viols.

低音提琴通常被算作提琴类，定弦为第四级音，颈部倾斜和背平是低音提琴的特点。

The double bass, usually considered amember of the violin family, is tuned in fourths and has thesloping shoulders and flat back characteristic of the viols.

低音提琴通常被算作提琴类，定弦为第四级音，颈部倾斜和背平是低音提琴的特点。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。