Contact substance
[医] 接触剂, 催化剂
🧩 词语组成解析
contact
['kɑntækt]
n. 接触;触点;[医]（传染病）接触人;门路;
vt. 使接触;与…联系;与…通讯（或通话）;
vi. 联系，接触;
con共同+tact接触→共同接触 → 接触；联系
🗣️ 情景例句
Please stay where you are, we'll have a patrol car there in two minutes.
请您呆在原地，两分钟之内我们派巡逻车过来。
I'm going to buy three yards.
我要买给她三码。
Look! That girl has fallen off her bicycle.
看！那个女孩从自行车上摔下来了。