This set is of toughened glass,and not easy to break. 这是钢化玻璃的，不易碎。
Nonetheless, there is still an effective contrast between the heavier elements of concrete and the comparatively lighter elements of prosaic drywall and tempered glass guardrails. 但是，在混凝土这种较沉重的元素与平淡的清水墙和淬火玻璃栏杆这些较轻的元素之间，仍然存在着一种明显的对照。
