重点讲解：
1. focus on
集中（注意力）；关注；
eg. I'd like you to focus on this project exclusively.
我希望你能把精力全放在这个项目上@X0arb.zH-8XrG~WXzXm。
eg. We focus on the temporal objective.
我们专注于短期的目标.mQoirRJrKs。
2. concentrate on
全神贯注；集中（心思）；
eg. They will concentrate on teaching the basics of reading, writing and arithmetic.
他们将集中教授阅读、写作和算术基础知识UCx&C&tx-8。
eg. The group plans to concentrate on six core businesses.
该集团打算主营6种业务A(AeodBBdX9C=zaF!V。
3. kind of
稍微；有几分；有点儿；
eg. She kind of hoped to be invited for her ex-boyfriend's wedding.
她有点儿希望被邀请参加前男友的婚礼&vqji#7Mg1T=BIvQ&J8。
eg. I've been feeling kind of blue lately.
我最近情绪有点儿低落X%wf~^pmM1azw。