侄子【zhí zi】
brother's son; nephew
[名]弟兄或其他同辈男性亲属的儿女子,也称朋友的儿子

几年不见,侄子都长这么大了。
Not seen for several years, my nephew has grown up.
直【zhí】
1. straighten 2. straight; just; upright 3. directly
[动]1、不弯曲 [形]2、公正的,正义的;成直线的 [副]3、顺着一个方向不变

两点间距离直线最短。
The shortest distance between two points is a straight line.

他为人耿直,乐于帮助朋友。
He is upright in nature and is always willing to help others.

这是一辆直达北京的旅游专列。
This is a non-stop tour train to Beijing.
直播【zhí bō】
live broadcast; broadcast live
[动]广播电台不经过录音直接播送或电视台不经录像直接播放

这个节目是事先录制的,不是现场直播。
This program was not a live broadcast but recorded in advance.