重点讲解：
1. tone down 使(言辞)温和；使(调子)缓和；收敛；
例句：She was trying to tone down the colors of the picture.
她正设法使画面的色调柔和一些。
2. at the same time 同时；
例句：You've got to be firm, but at the same time you must be sympathetic.
你态度要强硬，但还必须有同情心。
3. wash away 冲垮；冲走；
例句：He is trying to wash away his sins.
他正试图洗刷他的罪过。
4. calm down (使)平静下来；(使)镇定下来；
例句：Calm down, you're getting terribly wrought up over nothing.
镇定下来吧，你这样紧张激动，完全是莫名其妙。
