Detection nis, or ought to be, an exact science and should be treated in the same cold and unemotional manner.

侦探术是——或者应当是一种精确的科学，应当用同样冷静而不是感情用事的方法来研究它。

youdao

My dear kid, be a brave and warm kid. Try to be warm enough not to hurt yourself and try to be cold-tempered but not to have the cold injury. If you are bullied, boldly fight back in your own manner.

孩子，做一个勇敢而温暖的孩子，不暖到烫伤自己，也不冷到冻伤身体，如果有人打你，就勇敢地按照自己的方式回击。

youdao