Th

釷(90號元素)

學術名詞

• 輔助[型]T細胞：生命科學、高中生命科學
• 輔助[型]T淋巴球：生命科學、高中生命科學

英文釋義

1. the fifth day of the week; the fourth working day
2. a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands