Protective system
[经] 保护贸易制
🧩 词语组成解析
🗣️ 情景例句
Apply as much force as is necessary.
需用多少力量就用多少。
You really did it this time!
这下你可糟了！
Only the Earth provides ideal conditions, and even here it has taken more than four billion years for plant and animal life to evolve.
只有地球提供理想的条件，而即使在这里，植物和动物的进化也用了40亿年的时间。