- 拱心石gǒng xīn shí
keystone
- 基本原理jī běn yuán lǐ
frndamental, keystone, postulate, rationale, ultimate, ultimatum
- 梯形环tī xíng huán
keystone ring
- 楔石xiē shí
keystone
- 重点zhòng diǎn
emphases, keystone, pivot, stress
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