Pdms
等离子体解吸质谱法
🗣️ 情景例句
It's too hard to explain.
这很难解释清楚。
What will you do to help protect our environment from being seriously polluted?
你将为帮助保护我们的环境免遭到污染做些什么呢？
She suddenly got into a panic and stopped her car.
她一惊之下突然把车停了下来。