It is not known what caused their sudden spread, but experts have theorized that an increase in global travel and the banning of certain pesticides may be partly responsible.
至今它们大肆传播的确切原因不得而知，但专家表示，可能的因素包括全球旅行的增加和某些杀虫剂的禁用。
They also partly suppress the body's own immune reaction to any cancer growths, making the cancer more prone to spread.
这些药物也有一定的抑制人体自身抑制癌症生长免疫反应，使癌细胞更容易扩散。
That is partly because fire can spread, and your neighbours should not suffer for your carelessness.
部分原因是，火势可能会蔓延，你的邻居不应因为你的粗心而遭受损失。
Messrs Oliner, Sichel and Stiroh show that productivity growth was spread more broadly across industries and was partly the result of the reallocation of resources between firms.
奥利纳、西切尔以及斯提洛先生们表示生产率的增长被更为广泛的在企业间传播，并且部分是由于资源在企业间的重新分配。
That is partly because Republicans won almost every marginal seat in the state at the last election, leaving themselves already thinly spread.
这样的情形，在一定程度上是由于共和党在上次选举中几乎赢得了所有的边际席位，所以他们的分布已经很稀疏。
Partly because of rumours spread by rival scientists, both had trouble maintaining security clearances in the super-clandestine field of anti-submarine warfare.
还有一部分原因是由于反科学家所造的谣言，两者都无法维持在反潜战高级秘密领域的安全。
The woodpile, carefully divided in two by a rusty sheet of corrugated tin, spread out in both directions, partly filling the long front porch.
那个柴火堆被一块生锈的皱铁皮仔细的一分为二，铁皮向两个方向展开，把前面的长门廊占据了一部分。
For those with metastatic liver cancer, life expectancy is similar, but depends partly on the spread of cancer elsewhere.
对于转移性肿瘤，生存期也类似，但是部分病人的生命期建立在肿瘤转移的情况。
For those with metastatic liver cancer, life expectancy is similar, but depends partly on the spread of cancer elsewhere.
对于转移性肿瘤，生存期也类似，但是部分病人的生命期建立在肿瘤转移的情况。
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