With in-source collision induced dissociation (CID) and exact mass measurement, the differences between the calculated mass and the theoretical mass of all compounds and fragments were less than 2.

对经过液相色谱分离后的化合物进行源内碰撞诱导裂解(CID)，并对化合物及其碎片离子进行精确质量测定，测定质量与理论质量之间误差不超过2。

youdao

Working out an animal's mass from the size of its bones is not, of course, an exact science.

通过其骨骼尺寸计算出动物体重当然不是严密的科学。

youdao

The annealed RNA duplex is further analyzed by mass spectrometry to verify the exact composition of the duplex.

退火的RNA双链通过质谱分析来证实其精确的组成。

youdao

He said the next stage was to confirm its exact identity using mass spectrometry and nuclear magnetic resonance analyses to produce it chemically on a larger scale.

BBC: Maggots could help in MRSA battle

If all goes well, Pegatron could begin mass production of the CDMA iPhone (exact model not disclosed) this September, so it's hard to say if Sprint or Verizon would have access before the all-too-lucrative holiday season.

ENGADGET: WSJ: Apple 'developing new iPhone,' plus another for Verizon (update: iPhone HD, front-facing camera?)

Having reached a more than critical mass in its retail segment, Depot can exact good terms from suppliers and retaliate against competitors who try to undersell it.

FORBES: Profit in a Big Orange Box