主要针对研究生，便于研究生积累工作经验同时帮助老师们分担任务，同时也是贫困学生获得补助的一种途径。一般月工资为200~500元左右。
三种来自日本的协助犬——两只导盲犬、一只助听犬和两只介助犬将演示如何帮助残疾人。
Three types of assistance dogs from Japan: two guide dogs , a hearing dog and two mobility dogs , will show how they help disadvantaged people.
或许全世界人口中有三分之一正遭受着微量营养素不足的问题，这是些有助于身体与大脑成长、并助其抵御疾病的物质。
Perhaps a third of the world's people suffer from a lack of micronutrients, substances that help bodies and brains to grow and resist disease.
三件事助他抵消麦凯恩的军事专长。
Three things helped him neutralise John McCain’s military expertise.
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