stiff concrete

例句：

1. 1. The chair is toostiff to sit on comfortably.
   这把椅子太硬了，坐起来不舒服。
2. 2. Theweather has turned so cold that it's hard to move around.
   天气变得如此寒冷，以至于很难移动。
3. 3. Theold man was stiff withage and couldn't getup from his chair easily.
   老人年纪大了，从椅子上站起来很困难。