Sin qua non
[法] 绝对必需, 必要条件, 不可缺
🧩 词语组成解析
sin
[sin]
n. 违背宗教[道德原则]的恶行;罪恶，罪孽;过错，罪过;愚蠢的事，可耻的事;
vi. 犯罪，犯过错;
vt. 犯罪;
prep. 作为
non
[[nɔn]]
adv. 非, 不
🗣️ 情景例句
Practice tenses as much as possible.
操练各种时态。
Don't halloo till you are out of the wood.
没有脱离危险不要先欢呼。
Because of this, we kept looking back, wondering if we were leaving a trail of oil and petrol behind us.
因此，我们不时地掉过头，怀疑车后是否留下了机油和汽油的痕迹。