Doctrines
n. 教条( doctrine的复数形式 ); 教义; 学说; （政府政策的）正式声明
🗣️ 情景例句
Take no chances with it.
这事儿可不能碰运气。
Know something like the palm of one's hand.
熟知其事，了如指掌。
The hovercraft is particularly useful in large areas with poor communications such as Africa or Australia;
气垫船在非洲、澳大利亚等交通不发达地区特别有用。