The child 's work at school is about average .. 这孩子学习成绩中常。
In my job , i mix with all sorts of people . 我在工作中常和各种人打交道。
Lysophospholipids are often observed in plant lipid extracts . 溶血磷脂在植物类脂提取物中常看到。
A purple intemetallic phase (called purple plaque) is commonly found in bonding . 键合中常能发现一种紫色的金属化合物，称为紫斑。
Ethmoid sinusitis is frequently complicated in children by orbital cellulitis and abscess . 筛窦炎在儿童中常并发眼眶蜂窝织炎及脓肿。
This disposition is often used as an explanatory principle in biology and psychology . 在生物学和心理学中常将这种特性作为解释问题的原则。
Vortex injection provides a form of swirl or cyclone combustion for a rocket engine similar to systems often employed in industrial furnaces . 涡流喷射在火箭发动机中产生一种涡流或旋涡形式的燃烧，与工业炉中常采用的系统相似。
Road , street , lane and avenue are the most common words used in street names and are often abbreviated in addresses to rd , st , la and ave . 路、街、胡同和大街是用于街道名称中最常用的词，在地址中常缩写为Rd、St、La和Ave。
The sun and the moon are often personified in poetry 诗歌中常把日、月拟人化
Common mistakes made by students in science experiments 学生在科学实验中常犯的错误
