Improperly implemented, dials can be extremely difficult to manipulate.
如果设计不当，刻度盘将会非常难于操作。
During this time the size of the embryo does not increase, so the cells become smaller and smaller and they are strongly attached to each other which makes them more difficult to manipulate.
在这段时间内胚胎的大小并未增加，因此细胞体积越来越小且彼此间连接紧密，导致较难对细胞进行操作。
During this time the size of the embryo does not increase, so the cells become smaller and smaller and they are strongly attached to each other which makes them more difficult to manipulate.
在这段时间内胚胎的大小并未增加，因此细胞体积越来越小且彼此间连接紧密，导致较难对细胞进行操作。
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