- 重点词汇
- 中心
center; centre; hub; heart; focus; nucleus; epicenter; focal point; kernel; centre stage; locus; pivot; middle; seat; heartbeat; nub; capital; base; board; central; focal
- 静脉
vein; vena; venous
- 测定
determine; take; assay; gauge; determination
- 方法
method; way; means; manner; road; avenue; gateway; route; measure; approach; mode; system; channel; medium; methodology; formula; prescription; recipe; technique; tool; device; instrument; mechanism; mechanic; tack; line; view; lever; technical