求翻译：当年，延安的生活非常艰难。肺结核等疾病普遍流行。海伦在书中写道：“在铺着砖的地面，栖居着各种昆虫，有相互争斗的，也有紧紧拥挤在一起的”。这些昆虫小生物包括蝎子、蜈蚣、虱子还有跳蚤等，老鼠在木椽上来回奔跑，彻夜不休。她接着写道：“传播鼠疫的是跳蚤，而不是老鼠。这种致命的疾病，在地球上依然流行的地方已经不多了，而陕北却是其中之一。……每到晚上，我常常饥饿得难以入睡，就啃几口干馒头”。海伦当年离开延安时，体重减少到不足40公斤。因为她染上了阿米巴痢疾和其他四种类似的疾病，不得不去接受医生的重点治疗。是什么意思？

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In that year, Yan'an in a difficult life. Tuberculosis and other diseases prevalent. In the book, Helen wrote: "on the pavement with a brick floor, home to a variety of insects, and the rivalries that are tightly packed together. These small creatures including insects, centipedes, and scorpions are

In that year, yan's life is very difficult. High prevalence of disease such as tuberculosis. Helen writes: "shop in a brick surface, inhabit a variety of insects, there are competing, there are closely crowded together". These small creatures including Scorpions, centipedes, insects such as lice or