词义辨析：intricate, complex, complicated, sophisticated,
intricate: 着重指错综复杂，令人迷惑理解
complex: 侧重内在关系的复杂，需通过仔细研究与了解才能掌握和运用
complicated: 与complex的含义接近，但语气更强，着重极其复杂，很难分析、分辨或解释
sophisticated: 侧重指事物发展到或达到高级的程度所体现出的复杂
The steps were very intricate and their faces were intent and concentrated.
舞步错综复杂，脸色全神贯注。