n. 一个人（跟“集体”相对）, individual, personal (as opposed to "the collective"); 自称，我（在正式场合发表意见时用）, (used on formal occasions to address oneself when one expresses one’s opinion) oneself

v. 离别时打招呼或说句话, (by way of a wave of one’s hand or words of pleasantry) leave, say goodbye to

n. 事物的根源或最重要的部分, foundation, base; adj. 主要的, 重要的, basic, fundamental, essential; adv. 本来，从头到尾（多用于否定式）, at all, simply (mostly used in a negative form)

pron. 各人自己，各个方面自己的一方, each, respective

能够独立完成某一技术设计、施工的专门人员

n. 进行生产劳动时所使用的器具, tool, instrument; 比喻用以达到目的的手段或事物, instrument, something used to reach a certain purpose