"excellent thing" (especially a rousing speech), 1892, from stem-winding watches (1875), which were advanced and desirable when introduced. See stem (n.) + wind (v.1).
权威例句
1. Twist the string carefully around the second stem with the other hand.
用另外一只手小心地把细绳缠绕到第二根茎上。
2. Cut them off cleanly through the stem just below the node.
就从茎节下面,沿茎干把它们全砍掉。
3. The stinging nettle has a square stem and little hairs.
荨麻长有四方茎和细小茸毛。
4. He chewed the stem of his pipe and eyed her sceptically.
他嘴里衔着烟斗柄,满腹狐疑地打量着她。
5. Make a slit in the stem about half an inch long.