HSK 7-9
坚实
jiānshí形
firm and substantial; solid
桥墩为大桥提供坚实支撑。
Qiáo dūn wèi dà qiáo tí gōng jiān shí zhī chēng.
The piers provide solid support for the bridge.
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Appears across levels (7-9) in the HSK 3.0 word list.