Mathematics is the key and door to the sciences.
数学是科学的钥匙和门。
In teaching history， there should be extensive discussion of personalities who benefited mankind through independence of character and judgement.
Success is going from failure to failure without losing enthusiasm.
The best performance improvement is the transition from the nonworking state to the working state.
The great challenge of modern politics is to reconcile the demands of identity with the requirements of liberal democracy.
