to engrave in one's memory

n. 一种外交文书，内容通常是说明立场、态度或某种情况a type of diplomatic document, the content usually explains a position, attitude, or a certain situation; 随时记录下来用来查阅的笔记notes recorded at any time for reference

bright and beautiful

proposition (logic, math.), to assign an essay topic

bright, clear, obvious, forthright, open-minded, bright and cheerful

因看不见或弄不清楚情况而试探着(前进或做事)