钻坚仰高

1. • lit. looking up to it, it gets higher boring into it, it gets harder (idiom) (from Analects)
2. • fig. to delve deeply into one's studies
3. • meticulous and diligent study

Character by character

• 钻(zuān)drill
• 坚(jiān)strong
• 仰(yǎng)surname Yang
• 高(gāo)surname Gao