针【zhēn】
1. needle; pin 2. needle; pin 3. injection
[名] 1、缝织衣物引线用的一种细长的工具 2、细长像针的东西 3、注射用的器具和药物

她被针扎了一下。
She pricked herself on a needle.

凝聚在松针上的露珠,晶莹剔透。
The dewdrops on the pine needles look like crystals.

小男孩勇敢地伸出手来打针。
The little boy bravely stretched out his hand for the injection.
针对【zhēn duì】
counter; be aimed at; in the light of; in view of
[动] 专有所指

针对环境污染的情况,政府关闭了一些污染大的小工厂。
In view of the environmental pollution, the government closed some small factories which caused serious pollution.
针灸【zhēn jiǔ】
1. acupuncture 2. to give or have acupuncture
[名] 1、以针刺艾灸防治疾病的方法 [动] 2、以针刺艾灸防治疾病

针灸是中医的传统疗法。
Acupuncture is the traditional treatment method of Chinese medicine.

老中医正在给病人针灸治疗。
The veteran practitioner of traditional Chinese medicine is treating the patient with acupuncture.