1. However, most people with low iron reserves don't know they have a deficiency, because traditional methods of calculating the amount of iron in blood (by checking levels of the blood protein that transports oxygen) are not sufficient, Beard states.
    然而，比尔德指出，大多数铁离子储量低的人并未意识到自己缺铁，因为传统的检测血液中铁离子储量的方法——只检验血液中输送氧气的血蛋白的含量——是不够的。

2. It was a hideous act, but it helped the African to stay put on one plantation, since no calculating planter would care to part with a crippled slave for the current price of one dollar.
    这是一种惨不忍睹的暴行，但却使他在一家种植园呆了下来。因为没有一个精于算计的种植园主，会愿意为了一个美元而卖掉一个瘸腿的奴隶。