Once the temperature crosses a certain threshold, the chemical reaction accelerates dramatically, altering the compound's structure.
一旦温度超过某个临界点，化学反应会急剧加速，改变化合物的结构。
Which choice best defines “threshold”?
B — The level or point at which something starts or changes. “threshold” means the level or point at which something starts or changes.
Which word means “the level or point at which something starts or changes”?
A — threshold. “threshold” means the level or point at which something starts or changes.
threshold — the level or point at which something starts or changes. In Chinese: 门槛.
threshold is pronounced /ˈθrɛʃhoʊld/.
Once the temperature crosses a certain threshold, the chemical reaction accelerates dramatically, altering the compound's structure. (一旦温度超过某个临界点，化学反应会急剧加速，改变化合物的结构。)
limit, boundary, brink — all close in meaning to threshold (the level or point at which something starts or changes).
Yes. threshold is on the SAT Prep Basic list — the everyday academic words the SAT assumes you already have. The Digital SAT does not test vocabulary in isolation; words like this one are tested through Words in Context questions, where you choose the word that completes a passage most logically and precisely.