研究人员表示气球和化学物质的重量将相当于数辆双层汽车，运送它们需要非常大的卡车。

Researchers said the weight of the balloon and chemicals would match several double decker buses, requiring a very large vessel.

youdao

同位素是存在于元素的变体，天然存在，同位素与元素具有相同的化学性质，但由于所含的中子数不同而重量不同。

These are naturally occurring variants of elements,which share the same chemical properties but have different weights because their nuclei contain different numbers of neutrons.

youdao

我以前总担心理想的公里数、逐步增加公里数的比例、休息、几次几组、重量和增重过程、锻炼肌肉、各种日程安排。着实复杂得紧。

I used to worry about the ideal mileage, percentage of increase in mileage, intervals, reps and sets, weights and progression, lifts, workouts, programs... it was very complicated.

youdao